Fix upload script.

Build/upload.ps1

@@ -1,5 +1,7 @@
 param([string]$apiKey)
 
+Invoke-WebRequest -Uri "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe" -OutFile "nuget.exe"
+
 $files = Get-ChildItem -Path ".\NuGet" -Filter "*.nupkg"
 foreach ($file in $files)
 {
@@ -7,3 +9,5 @@ foreach ($file in $files)
 
 	.\nuget.exe push $file.Fullname $apiKey -NoSymbols -Source https://api.nuget.org/v3/index.json
 }
+
+Remove-Item "nuget.exe" -Force -Recurse -ErrorAction SilentlyContinue