Trying to use AppVersion env in yml file

AppVeyor/appveyor.yml

@@ -1,4 +1,4 @@
-version: 11.2.1.{build}
+version: $(AppVersion).{build}
 image: Visual Studio 2015
 configuration:
 - Release

AppVeyor/install.ps1

@@ -4,4 +4,7 @@ if ($match.Success)
 {
     $env:AppVersion = $match.Groups[1].Value
 }
-Write-Host "Test: ShareX $env:AppVersion"
+else
+{
+    $env:AppVersion = "1.0.0"
+}