fix update script thing

SPTInstaller/Resources/update.ps1

@@ -15,13 +15,48 @@ if ($installer -ne $null)
     return;
 }
 
+if (-not(Test-Path $source) -and -not(Test-Path $destination)) {
+    Write-Warning "Can't find a required file"
+    Write-host ""
+    Write-Host "Press [enter] to close ..."
+    Read-Host
+    exit
+}
+
 Write-Host "Copying new installer ..."
 
-Import-Module BitsTransfer
+$maxAttempts = 10
+$copied = $false
 
-Start-BitsTransfer -Source $source -Destination $destination
+while (-not $copied) {
 
-Remove-Module BitsTransfer
+    $maxAttempts--
+    
+    Write-Host "Please wait ..."
+    
+    if ($maxAttempts -le 0) {
+        Write-Host "Couldn't copy new installer :(   Please re-download the installer"
+        Write-Host ""
+        Write-Host "Press [enter] to close ..."
+        Read-Host
+        exit
+    }
+    
+    Remove-Item $destination -ErrorAction SilentlyContinue
+    Copy-Item $source $destination
+    
+    if (Test-Path $destination) {
+        $sLength = (Get-Item $source).Length
+        $dLength = (Get-Item $destination).Length
+        
+        if ($sLength -eq $dLength) {
+            $copied = $true
+            break
+        }
+        
+        sleep(2)
+    }
+}
 
 # remove the new installer from the cache folder after it is copied
 Remove-Item -Path $source