diff --git a/.gitignore b/.gitignore
index be4823ff5..692f9404f 100755
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,4 @@
 /windows/ZeroTierOneInstaller/ZeroTierOneInstaller
 /windows/ZeroTierOne/Release
 /ext/installfiles/windows/ZeroTier One-SetupFiles
+/ext/installfiles/windows/Prerequisites
diff --git a/ext/installfiles/windows/ZeroTier One.aip b/ext/installfiles/windows/ZeroTier One.aip
index 64f5e448c..3b9010495 100644
--- a/ext/installfiles/windows/ZeroTier One.aip	
+++ b/ext/installfiles/windows/ZeroTier One.aip	
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <DOCUMENT Type="Advanced Installer" CreateVersion="10.9" version="10.9.1" Modules="professional" RootPath="." Language="en" Id="{DC564647-6BF0-4550-87F4-89C938D0159C}">
   <COMPONENT cid="caphyon.advinst.msicomp.ProjectOptionsComponent">
-    <ROW Name="HiddenItems" Value="UpdaterComponent;PreReqComponent;MsiExtComponent;MsiAssemblyComponent;ActSyncAppComponent;MsiThemeComponent;BackgroundImagesComponent;DictionaryComponent;CPLAppletComponent;MsiClassComponent;WebApplicationsComponent;MsiOdbcDataSrcComponent;MsiAppSearchComponent;MsiInstExSeqComponent"/>
+    <ROW Name="HiddenItems" Value="UpdaterComponent;MsiExtComponent;MsiAssemblyComponent;ActSyncAppComponent;MsiThemeComponent;BackgroundImagesComponent;DictionaryComponent;CPLAppletComponent;MsiClassComponent;WebApplicationsComponent;MsiOdbcDataSrcComponent;MsiAppSearchComponent"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiPropsComponent">
     <ROW Property="AI_BITMAP_DISPLAY_MODE" Value="0"/>
@@ -49,6 +49,8 @@
     <ROW Directory="x86_Dir" Directory_Parent="tapwindows_Dir" DefaultDir="x86"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiCompsComponent">
+    <ROW Component="C67108D39D05435F9BE6B977F2CCED25" ComponentId="{C88E3364-EE07-458A-8B38-E974439934A0}" Directory_="APPDIR" Attributes="4" KeyPath="C67108D39D05435F9BE6B977F2CCED25" Options="2"/>
+    <ROW Component="EF36CDD6CE40CFA978040EA5CBA799" ComponentId="{3E1E1C91-C926-4027-A3AE-61FCC006CA9E}" Directory_="APPDIR" Attributes="4" KeyPath="EF36CDD6CE40CFA978040EA5CBA799" Options="2"/>
     <ROW Component="ProductInformation" ComponentId="{DB078D04-EA8E-4A7C-9001-89BAD932F9D9}" Directory_="APPDIR" Attributes="4" KeyPath="Version"/>
     <ROW Component="Qt5Core.dll" ComponentId="{F6BFD713-0DD7-411C-BE9A-7A5A902814F2}" Directory_="APPDIR" Attributes="0" KeyPath="Qt5Core.dll"/>
     <ROW Component="Qt5Gui.dll" ComponentId="{9005A0ED-9E05-4E7B-8083-AC57131BCF98}" Directory_="APPDIR" Attributes="0" KeyPath="Qt5Gui.dll"/>
@@ -74,6 +76,8 @@
     <ROW Component="zttap200.cat_1" ComponentId="{BA0FB826-479C-46E8-AB2C-9017D40A99D8}" Directory_="x86_Dir" Attributes="0" Condition="NOT VersionNT64" KeyPath="zttap200.cat_1" Type="0"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiFeatsComponent">
+    <ROW Feature="C67108D39D05435F9BE6B977F2CCED25" Title="Visual C++ Redistributable for Visual Studio 2012 x86" Description="Visual C++ Redistributable for Visual Studio 2012 x86" Display="5" Level="1" Attributes="0" Components="C67108D39D05435F9BE6B977F2CCED25"/>
+    <ROW Feature="EF36CDD6CE40CFA978040EA5CBA799" Title="Visual C++ Redistributable for Visual Studio 2012 x64" Description="Visual C++ Redistributable for Visual Studio 2012 x64" Display="3" Level="1" Attributes="0" Components="EF36CDD6CE40CFA978040EA5CBA799"/>
     <ROW Feature="ZeroTierOne" Title="MainFeature" Description="Description" Display="1" Level="1" Directory_="APPDIR" Attributes="0" Components="ProductInformation Qt5Core.dll Qt5Gui.dll Qt5Network.dll Qt5Widgets.dll WdfCoinstaller01011.dll WdfCoinstaller01011.dll_1 ZeroTierOne.exe devcon_x64.exe devcon_x86.exe icudt51.dll icuin51.dll icuuc51.dll libEGL.dll libGLESv2.dll networks.d qwindows.dll regid.201001.com.zerotier updates.d zerotierone_x64.exe zerotierone_x86.exe zttap200.cat zttap200.cat_1"/>
     <ATTRIBUTE name="CurrentFeature" value="ZeroTierOne"/>
   </COMPONENT>
@@ -130,6 +134,11 @@
     <ROW Fragment="WelcomeDlg.aip" Path="&lt;AI_THEMES&gt;classic\fragments\WelcomeDlg.aip"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiActionTextComponent">
+    <ROW Action="AI_DownloadPrereq" Description="Downloading prerequisite software" Template="Downloading [1]{[2] completed}" DescriptionLocId="ActionText.Description.AI_DownloadPrereq" TemplateLocId="ActionText.Template.AI_DownloadPrereq"/>
+    <ROW Action="AI_ExtractPrereq" Description="Extracting prerequisite software" Template="Extracting [1]{[2] completed}" DescriptionLocId="ActionText.Description.AI_ExtractPrereq" TemplateLocId="ActionText.Template.AI_ExtractPrereq"/>
+    <ROW Action="AI_InstallPostPrerequisite" Description="Installing prerequisite software" Template="Installing [1]{[2] completed}" DescriptionLocId="ActionText.Description.AI_InstallPrerequisite" TemplateLocId="ActionText.Template.AI_InstallPrerequisite"/>
+    <ROW Action="AI_InstallPrerequisite" Description="Installing prerequisite software" Template="Installing [1]{[2] completed}" DescriptionLocId="ActionText.Description.AI_InstallPrerequisite" TemplateLocId="ActionText.Template.AI_InstallPrerequisite"/>
+    <ROW Action="AI_VerifyPrereq" Description="Verifying prerequisites" Template="[1] was not installed correctly." DescriptionLocId="ActionText.Description.AI_VerifyPrereq" TemplateLocId="ActionText.Template.AI_VerifyPrereq"/>
     <ROW Action="AI_XmlCommit" Description="Committing XML file configurations." Template="Committing XML file configurations." DescriptionLocId="ActionText.Description.AI_XmlCommit" TemplateLocId="ActionText.Template.AI_XmlCommit"/>
     <ROW Action="AI_XmlConfig" Description="Executing XML file configurations" Template="Configuring XML file: &quot;[1]&quot;" DescriptionLocId="ActionText.Description.AI_XmlConfig" TemplateLocId="ActionText.Template.AI_XmlConfig"/>
     <ROW Action="AI_XmlInstall" Description="Generating actions to configure XML files" DescriptionLocId="ActionText.Description.AI_XmlInstall"/>
@@ -138,6 +147,7 @@
     <ROW Action="AI_XmlUninstall" Description="Generating actions to configure XML files" DescriptionLocId="ActionText.Description.AI_XmlUninstall"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiBinaryComponent">
+    <ROW Name="Prereq.dll" SourcePath="&lt;AI_CUSTACTS&gt;Prereq.dll"/>
     <ROW Name="ShortcutFlags.dll" SourcePath="&lt;AI_CUSTACTS&gt;ShortcutFlags.dll"/>
     <ROW Name="aicustact.dll" SourcePath="&lt;AI_CUSTACTS&gt;aicustact.dll"/>
     <ROW Name="xmlCfg.dll" SourcePath="&lt;AI_CUSTACTS&gt;xmlCfg.dll"/>
@@ -173,6 +183,9 @@
     <ROW Dialog_="VerifyReadyDlg" Control_="Install" Event="EndDialog" Argument="Return" Condition="AI_PATCH" Ordering="199"/>
     <ROW Dialog_="VerifyReadyDlg" Control_="Back" Event="NewDialog" Argument="PatchWelcomeDlg" Condition="AI_PATCH" Ordering="203"/>
     <ROW Dialog_="WelcomeDlg" Control_="Back" Event="[Text_Next]" Argument="[AI_Text_Next_Orig]" Condition="AI_INSTALL" Ordering="1" Options="2"/>
+    <ROW Dialog_="ExitDialog" Control_="Finish" Event="DoAction" Argument="AI_CleanPrereq" Condition="1" Ordering="301"/>
+    <ROW Dialog_="FatalError" Control_="Finish" Event="DoAction" Argument="AI_CleanPrereq" Condition="1" Ordering="102"/>
+    <ROW Dialog_="UserExit" Control_="Finish" Event="DoAction" Argument="AI_CleanPrereq" Condition="1" Ordering="101"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiCreateFolderComponent">
     <ROW Directory_="networks.d_Dir" Component_="networks.d"/>
@@ -180,13 +193,19 @@
     <ROW Directory_="regid.201001.com.zerotier_Dir" Component_="regid.201001.com.zerotier"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiCustActComponent">
+    <ROW Action="AI_AppSearchEx" Type="1" Source="Prereq.dll" Target="DoAppSearchEx"/>
     <ROW Action="AI_ApplyShortcutFlags" Type="3073" Source="ShortcutFlags.dll" Target="UpdateShortcutFlags" WithoutSeq="true"/>
     <ROW Action="AI_BACKUP_AI_SETUPEXEPATH" Type="51" Source="AI_SETUPEXEPATH_ORIGINAL" Target="[AI_SETUPEXEPATH]"/>
+    <ROW Action="AI_CleanPrereq" Type="65" Source="Prereq.dll" Target="CleanPrereq" WithoutSeq="true"/>
     <ROW Action="AI_DATA_SETTER" Type="51" Source="CustomActionData" Target="[~]"/>
     <ROW Action="AI_DATA_SETTER_1" Type="51" Source="CustomActionData" Target="[~]"/>
     <ROW Action="AI_DOWNGRADE" Type="19" Target="4010"/>
+    <ROW Action="AI_DownloadPrereq" Type="1" Source="Prereq.dll" Target="DownloadPrereq"/>
     <ROW Action="AI_DpiContentScale" Type="1" Source="aicustact.dll" Target="DpiContentScale"/>
+    <ROW Action="AI_ExtractPrereq" Type="65" Source="Prereq.dll" Target="ExtractPrereq"/>
     <ROW Action="AI_InstallModeCheck" Type="1" Source="aicustact.dll" Target="UpdateInstallMode" WithoutSeq="true"/>
+    <ROW Action="AI_InstallPostPrerequisite" Type="1" Source="Prereq.dll" Target="InstallPostPrereq"/>
+    <ROW Action="AI_InstallPrerequisite" Type="65" Source="Prereq.dll" Target="InstallPrereq"/>
     <ROW Action="AI_LaunchApp" Type="1" Source="aicustact.dll" Target="[#ZeroTierOne.exe]"/>
     <ROW Action="AI_PREPARE_UPGRADE" Type="65" Source="aicustact.dll" Target="PrepareUpgrade"/>
     <ROW Action="AI_PrepareShortcutFlags" Type="1" Source="ShortcutFlags.dll" Target="PrepareActionData"/>
@@ -196,6 +215,7 @@
     <ROW Action="AI_ResolveLocalizedCredentials" Type="1" Source="aicustact.dll" Target="GetLocalizedCredentials"/>
     <ROW Action="AI_SHOW_LOG" Type="65" Source="aicustact.dll" Target="LaunchLogFile" WithoutSeq="true"/>
     <ROW Action="AI_STORE_LOCATION" Type="51" Source="ARPINSTALLLOCATION" Target="[APPDIR]"/>
+    <ROW Action="AI_VerifyPrereq" Type="1" Source="Prereq.dll" Target="VerifyPrereq"/>
     <ROW Action="AI_XmlCommit" Type="11777" Source="xmlCfg.dll" Target="OnXmlCommit" WithoutSeq="true"/>
     <ROW Action="AI_XmlConfig" Type="11265" Source="xmlCfg.dll" Target="OnXmlConfig" WithoutSeq="true"/>
     <ROW Action="AI_XmlInstall" Type="1" Source="xmlCfg.dll" Target="OnXmlInstall" AdditionalSeq="AI_DATA_SETTER"/>
@@ -221,6 +241,8 @@
     <ROW Action="AI_DATA_SETTER" Condition="(REMOVE &lt;&gt; &quot;ALL&quot;)" Sequence="5101"/>
     <ROW Action="AI_XmlUninstall" Condition="(REMOVE)" Sequence="3102"/>
     <ROW Action="AI_DATA_SETTER_1" Condition="(REMOVE)" Sequence="3101"/>
+    <ROW Action="AI_VerifyPrereq" Sequence="1101"/>
+    <ROW Action="AI_AppSearchEx" Sequence="101"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiInstallUISequenceComponent">
     <ROW Action="AI_RESTORE_LOCATION" Condition="APPDIR=&quot;&quot;" Sequence="749"/>
@@ -228,13 +250,23 @@
     <ROW Action="AI_ResolveLocalizedCredentials" Sequence="52"/>
     <ROW Action="AI_DpiContentScale" Sequence="51"/>
     <ROW Action="AI_BACKUP_AI_SETUPEXEPATH" Sequence="99"/>
-    <ROW Action="AI_RESTORE_AI_SETUPEXEPATH" Condition="AI_SETUPEXEPATH_ORIGINAL" Sequence="101"/>
+    <ROW Action="AI_RESTORE_AI_SETUPEXEPATH" Condition="AI_SETUPEXEPATH_ORIGINAL" Sequence="102"/>
+    <ROW Action="ExecuteAction" Sequence="1299" SeqType="0" MsiKey="ExecuteAction"/>
+    <ROW Action="AI_DownloadPrereq" Sequence="1296"/>
+    <ROW Action="AI_ExtractPrereq" Sequence="1297"/>
+    <ROW Action="AI_InstallPrerequisite" Sequence="1298"/>
+    <ROW Action="AI_InstallPostPrerequisite" Sequence="1300"/>
+    <ROW Action="AI_AppSearchEx" Sequence="101"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiLaunchConditionsComponent">
+    <ROW Condition="( Version9X OR ( NOT VersionNT64 ) OR ( VersionNT64 AND ((VersionNT64 &lt;&gt; 502) OR (((VersionNT64 = 502) AND (ServicePackLevel &gt;= 1)) OR (MsiNTProductType &lt;&gt; 1))) AND ((VersionNT64 &lt;&gt; 502) OR (((VersionNT64 = 502) AND (ServicePackLevel &lt;&gt; 1)) OR (MsiNTProductType &lt;&gt; 1))) AND ((VersionNT64 &lt;&gt; 502) OR (((VersionNT64 = 502) AND (ServicePackLevel &lt;&gt; 2)) OR (MsiNTProductType &lt;&gt; 1))) ) )" Description="[ProductName] cannot be installed on the following Windows versions: [WindowsTypeNT64Display]" DescriptionLocId="AI.LaunchCondition.NoSpecificNT64" IsPredefined="true" Builds="DefaultBuild"/>
+    <ROW Condition="( Version9X OR VersionNT64 OR ( VersionNT AND ((VersionNT &lt;&gt; 500) OR ((VersionNT = 500) AND (ServicePackLevel &gt;= 1))) AND ((VersionNT &lt;&gt; 500) OR ((VersionNT = 500) AND (ServicePackLevel &lt;&gt; 1))) AND ((VersionNT &lt;&gt; 500) OR ((VersionNT = 500) AND (ServicePackLevel &lt;&gt; 2))) AND ((VersionNT &lt;&gt; 500) OR ((VersionNT = 500) AND (ServicePackLevel &lt;&gt; 3))) AND ((VersionNT &lt;&gt; 500) OR ((VersionNT = 500) AND (ServicePackLevel &lt;&gt; 4))) AND (((VersionNT &lt;&gt; 501) OR ((VersionNT = 501) AND (ServicePackLevel &gt;= 1))) OR VersionNT64) AND (((VersionNT &lt;&gt; 501) OR ((VersionNT = 501) AND (ServicePackLevel &lt;&gt; 1))) OR VersionNT64) AND (((VersionNT &lt;&gt; 501) OR ((VersionNT = 501) AND (ServicePackLevel &lt;&gt; 2))) OR VersionNT64) AND (((VersionNT &lt;&gt; 501) OR ((VersionNT = 501) AND (ServicePackLevel &lt;&gt; 3))) OR VersionNT64) ) )" Description="[ProductName] cannot be installed on the following Windows versions: [WindowsTypeNTDisplay]" DescriptionLocId="AI.LaunchCondition.NoSpecificNT" IsPredefined="true" Builds="DefaultBuild"/>
     <ROW Condition="(VersionNT &lt;&gt; 400)" Description="[ProductName] cannot be installed on the following Windows versions: [WindowsTypeNT40Display]" DescriptionLocId="AI.LaunchCondition.NoNT40" IsPredefined="true" Builds="DefaultBuild"/>
     <ROW Condition="VersionNT" Description="[ProductName] cannot be installed on [WindowsType9XDisplay]" DescriptionLocId="AI.LaunchCondition.No9X" IsPredefined="true" Builds="DefaultBuild"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiRegsComponent">
+    <ROW Registry="C67108D39D05435F9BE6B977F2CCED25" Root="-1" Key="Software\Caphyon\Advanced Installer\Prereqs\[ProductCode]\[ProductVersion]" Name="C67108D39D05435F9BE6B977F2CCED25" Value="1" Component_="C67108D39D05435F9BE6B977F2CCED25"/>
+    <ROW Registry="EF36CDD6CE40CFA978040EA5CBA799" Root="-1" Key="Software\Caphyon\Advanced Installer\Prereqs\[ProductCode]\[ProductVersion]" Name="EF36CDD6CE40CFA978040EA5CBA799" Value="1" Component_="EF36CDD6CE40CFA978040EA5CBA799"/>
     <ROW Registry="Path" Root="-1" Key="Software\[Manufacturer]\[ProductName]" Name="Path" Value="[APPDIR]" Component_="ProductInformation"/>
     <ROW Registry="Version" Root="-1" Key="Software\[Manufacturer]\[ProductName]" Name="Version" Value="[ProductVersion]" Component_="ProductInformation"/>
   </COMPONENT>
@@ -256,6 +288,15 @@
     <ROW UpgradeCode="[|UpgradeCode]" VersionMin="0.0.1" VersionMax="[|ProductVersion]" Attributes="257" ActionProperty="OLDPRODUCTS"/>
     <ROW UpgradeCode="[|UpgradeCode]" VersionMin="[|ProductVersion]" Attributes="2" ActionProperty="AI_NEWERPRODUCTFOUND"/>
   </COMPONENT>
+  <COMPONENT cid="caphyon.advinst.msicomp.PreReqComponent">
+    <ROW PrereqKey="C67108D39D05435F9BE6B977F2CCED25" DisplayName="Visual C++ Redistributable for Visual Studio 2012 x86" SetupFileUrl="Prerequisites\Visual C++ Redistributable for Visual Studio 2012 x86\vcredist_x86.exe" Location="0" ExactSize="0" Operator="1" TargetName="vcredist_x86.exe" Type="1" Feature="C67108D39D05435F9BE6B977F2CCED25"/>
+    <ROW PrereqKey="EF36CDD6CE40CFA978040EA5CBA799" DisplayName="Visual C++ Redistributable for Visual Studio 2012 x64" SetupFileUrl="Prerequisites\Visual C++ Redistributable for Visual Studio 2012 x64\vcredist_x64.exe" Location="0" ExactSize="0" WinNTVersions="Windows 9x/ME/NT/2000/XP/Vista/Windows 7/Windows 8 x86/Windows 8.1 x86" Operator="1" Options="x" TargetName="vcredist_x64.exe" Type="1" Feature="EF36CDD6CE40CFA978040EA5CBA799"/>
+    <ATTRIBUTE name="PrereqsOrder" value="EF36CDD6CE40CFA978040EA5CBA799 C67108D39D05435F9BE6B977F2CCED25"/>
+  </COMPONENT>
+  <COMPONENT cid="caphyon.advinst.msicomp.PreReqSearchComponent">
+    <ROW SearchKey="C67108D39D05435F9BE6B977F2CCED25_VC_2012_SEARCH" Prereq="C67108D39D05435F9BE6B977F2CCED25" SearchType="2" SearchString="HKLM\Software\Microsoft\DevDiv\vc\Servicing\11.0\RuntimeMinimum\Version" VerMin="11.0" Order="1" Property="AI_VC_2012_PREREQSEARCH_X64_PROP"/>
+    <ROW SearchKey="EF36CDD6CE40CFA978040EA5CBA799_VC_2012_SEARCH" Prereq="EF36CDD6CE40CFA978040EA5CBA799" SearchType="2" SearchString="HKLM\Software\Microsoft\DevDiv\vc\Servicing\11.0\RuntimeMinimum\Version" VerMin="11.0" Order="1" Property="AI_VC_2012_PREREQSEARCH_PROP" Platform="1"/>
+  </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.SoftwareIdentificationComponent">
     <ATTRIBUTE name="LocalFile" value="regid.199509.com.example_ProductName.swidtag"/>
     <ATTRIBUTE name="SystemFile" value="regid.199509.com.example_ProductName.swidtag_1"/>