diff --git a/AMBuildScript b/AMBuildScript
index 451d665..a6d6634 100644
--- a/AMBuildScript
+++ b/AMBuildScript
@@ -37,6 +37,15 @@ Source2 = {
   'windows': ['x86', 'x86_64'],
   'linux': ['x86_64'],
 }
+Insurgency = {
+  'windows': ['x86', 'x86_64'],
+  'linux': ['x86'],
+  'mac': ['x86', 'x86_64'],
+}
+Blade = {
+  'windows': ['x86', 'x86_64'],
+  'linux': ['x86_64']
+}
 
 PossibleSDKs = {
   'episode1':  SDK('HL2SDK', '2.ep1', '1', 'EPISODEONE', WinLinux, 'episode1'),
@@ -56,8 +65,8 @@ PossibleSDKs = {
   'csgo': SDK('HL2SDKCSGO', '2.csgo', '21', 'CSGO', CSGO, 'csgo'),
   'dota': SDK('HL2SDKDOTA', '2.dota', '22', 'DOTA', [], 'dota'),
   'portal2':  SDK('HL2SDKPORTAL2', '2.portal2', '17', 'PORTAL2', [], 'portal2'),
-  'blade':  SDK('HL2SDKBLADE', '2.blade', '18', 'BLADE', WinOnly, 'blade'),
-  'insurgency':  SDK('HL2SDKINSURGENCY', '2.insurgency', '19', 'INSURGENCY', WinLinuxMac, 'insurgency'),
+  'blade':  SDK('HL2SDKBLADE', '2.blade', '18', 'BLADE', Blade, 'blade'),
+  'insurgency':  SDK('HL2SDKINSURGENCY', '2.insurgency', '19', 'INSURGENCY', Insurgency, 'insurgency'),
   'doi':  SDK('HL2SDKDOI', '2.doi', '20', 'DOI', WinLinuxMac, 'doi'),
   'contagion':  SDK('HL2SDKCONTAGION', '2.contagion', '14', 'CONTAGION', WinOnly, 'contagion'),
   'bms':  SDK('HL2SDKBMS', '2.bms', '10', 'BMS', WinLinux, 'bms'),
diff --git a/appveyor.yml b/appveyor.yml
index 72725aa..7a05d87 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,96 +1,18 @@
 version: 1.0.{build}
 image: Visual Studio 2015
 clone_folder: c:\projects\metamod-source
+clone_depth: 1
+environment:
+  SDKS: csgo,l4d2,tf2,episode1,insurgency
 install:
-- ps: >-
-    Function Checkout-Repo($name, $branch, $repo, $origin)
-
-    {
-        if (-not (Test-Path $name -PathType Container))
-        {
-            git clone $repo -b $branch $name 2>&1 | Write-Host
-            if ($origin)
-            {
-                cd $name
-                git remote rm origin 2>&1 | Write-Host
-                git remote add origin $origin 2>&1 | Write-Host
-                cd ..
-            }
-        }
-        else
-        {
-            cd $name
-            git checkout $branch 2>&1 | Write-Host
-            git pull origin $branch 2>&1 | Write-Host
-            cd ..
-        }
-    }
-
-
-    Set-Location $env:APPVEYOR_BUILD_FOLDER
-
-    [System.Environment]::CurrentDirectory = Get-Location
-
-
-    cd ..
-
-    [System.Environment]::CurrentDirectory = Get-Location
-
-
-    if (-not (Test-Path "metamod-source" -PathType Container))
-
-    {
-        Write-Error "Could not find a MetaMod:Source repository; make sure you aren't running this script inside it."
-        Exit 1
-    }
-
-
-    $SDKS = @( "csgo", "l4d2", "tf2", "episode1" )
-
-    if (-not (Test-Path "hl2sdk-proxy-repo" -PathType Container))
-
-    {
-        git clone --mirror https://github.com/alliedmodders/hl2sdk hl2sdk-proxy-repo 2>&1 | Write-Host
-    }
-
-    else
-
-    {
-        cd hl2sdk-proxy-repo
-        git fetch 2>&1 | Write-Host
-        cd ..
-    }
-
-
-    $SDKS | % {
-        Checkout-Repo "hl2sdk-$_" $_ "hl2sdk-proxy-repo" "https://github.com/alliedmodders/hl2sdk"
-    }
-
-
-    Checkout-Repo "ambuild" "master" "https://github.com/alliedmodders/ambuild"
-
-    cd ambuild
-
-    & c:\python27\python.exe setup.py install
-
-
-    [System.Environment]::CurrentDirectory = "c:\projects\"
-
-    Set-Location "c:\projects\"
-
-
-    #Checkout-Repo "amtl" "master" "https://github.com/alliedmodders/amtl"
-
-
-    Set-Location $env:APPVEYOR_BUILD_FOLDER
-
-    [System.Environment]::CurrentDirectory = Get-Location
+# https://www.appveyor.com/docs/windows-images-software/#python
+- cmd: set PATH=C:\Python38;C:\Python38\Scripts;%PATH%
+- cmd: git pull
+- cmd: cd ..
+- ps: metamod-source/support/checkout-deps.ps1 -SDKs ($env:SDKS -split ',')
+- cmd: cd metamod-source
 build_script:
-- cmd: >-
-    "%VS140COMNTOOLS%\vsvars32.bat"
-
-    mkdir opt32 && cd opt32
-
-    C:\python27\python.exe ..\configure.py --enable-optimize --sdks=csgo,l4d2,tf2,episode1
-
-    C:\python27\Scripts\ambuild
\ No newline at end of file
+- cmd: mkdir build
+- cmd: cd build
+- cmd: python ../configure.py --enable-optimize --sdks=%SDKS% --targets=x86,x86_64
+- cmd: ambuild
diff --git a/support/checkout-deps.ps1 b/support/checkout-deps.ps1
new file mode 100644
index 0000000..c424ec7
--- /dev/null
+++ b/support/checkout-deps.ps1
@@ -0,0 +1,133 @@
+<#
+.SYNOPSIS
+    Downloads dependencies for compiling MetaMod:Source.
+.PARAMETER SDKs
+    List of HL2SDK branch names to downloads.
+#>
+
+[CmdletBinding()]
+param(
+    [string[]]$SDKs = @(
+        'csgo',
+        'hl2dm',
+        'nucleardawn',
+        'l4d2',
+        'dods',
+        'l4d',
+        'css',
+        'tf2',
+        'insurgency',
+        'sdk2013',
+        'dota',
+        'orangebox',
+        'blade',
+        'episode1',
+        'bms',
+        'darkm',
+        'swarm',
+        'bgt',
+        'eye',
+        'contagion',
+        'doi'
+        )
+)
+
+Function Get-Repository
+{
+    param(
+        [Parameter(Mandatory=$true)][string]$Name,
+        [Parameter(Mandatory=$true)][string]$Branch,
+        [Parameter(Mandatory=$true)][string]$Repo,
+        [string]$Origin
+    )
+
+    If (-not (Test-Path $Name -PathType Container))
+    {
+        & git clone $Repo -b $Branch $Name 2>&1 | Write-Host
+        If ($Origin)
+        {
+            Set-Location $Name
+            & git remote set-url origin $Origin 2>&1 | Write-Host
+            Set-Location ..
+        }
+    }
+    Else
+    {
+        Set-Location $Name
+        If ($Origin)
+        {
+            & git remote set-url origin ..\$Repo 2>&1 | Write-Host
+        }
+        & git checkout $Branch 2>&1 | Write-Host
+        & git pull origin $Branch 2>&1 | Write-Host
+        If ($Origin)
+        {
+            & git remote set-url origin $Origin 2>&1 | Write-Host
+        }
+        Set-Location ..
+    }
+}
+
+if (-not (Test-Path "metamod-source" -PathType Container))
+{
+    Write-Error "Could not find a MetaMod:Source repository; make sure you aren't running this script inside it."
+    Exit 1
+}
+
+if (-not (Test-Path "hl2sdk-proxy-repo" -PathType Container))
+{
+    & git clone --mirror https://github.com/alliedmodders/hl2sdk hl2sdk-proxy-repo 2>&1 | Write-Host
+}
+else
+{
+    Set-Location hl2sdk-proxy-repo
+    & git fetch 2>&1 | Write-Host
+    Set-Location ..
+}
+
+$SDKS | ForEach-Object {
+    Get-Repository -Name "hl2sdk-$_" -Branch $_ -Repo "hl2sdk-proxy-repo" "https://github.com/alliedmodders/hl2sdk.git"
+}
+
+# Find a suitable installation of Python
+$PYTHON_CMD = Get-Command 'python' -ErrorAction SilentlyContinue
+if ($NULL -eq $PYTHON_CMD)
+{
+    $PYTHON_CMD = Get-Command 'python3' -ErrorAction SilentlyContinue
+    if ($NULL -eq $PYTHON_CMD)
+    {
+        $PYTHON_CMD = Get-Command 'py' -ErrorAction SilentlyContinue
+        if ($NULL -eq $PYTHON_CMD)
+        {
+            Write-Error 'No suitable installation of Python detected'
+            Exit 1
+        }
+    }
+}
+
+$PYTHON_CMD = $PYTHON_CMD.Source # Convert the result into a string path.
+
+& $PYTHON_CMD -c 'import ambuild2' 2>&1 1>$NULL
+if ($LastExitCode -eq 1)
+{
+    Write-Host -ForegroundColor Red "AMBuild is required to build MetaMod:Source"
+
+    # Ensure PIP is installed, otherwise, install it.
+    & $PYTHON_CMD -m pip --version 2>&1 1>$NULL # We use PIP's '--version' as it's the least verbose.
+    if ($LastExitCode -eq 1) {
+        Write-Host -ForegroundColor Red 'The detected Python installation does not have PIP'
+        Write-Host 'Installing the latest version of PIP available (VIA "get-pip.py")'
+
+        $GET_PIP = Join-Path $(Resolve-Path './') 'get-pip.py'
+        Invoke-WebRequest -Uri "https://bootstrap.pypa.io/get-pip.py" -OutFile $GET_PIP
+
+        & $PYTHON_CMD $GET_PIP
+        if ($LastExitCode -eq 1) {
+            Write-Error 'Installation of PIP has failed'
+            Exit 1
+        }
+    }
+
+    Get-Repository -Name "ambuild" -Branch "master" -Repo "https://github.com/alliedmodders/ambuild.git"
+    & $PYTHON_CMD -m pip install ./ambuild
+}