Upgraded from Launchbox v10.10 to v12.6 - now errors occur when downloading new media

[MRPLAT]

Hello,

I was wondering if someone could provide me with some help please.

I hadn't used Lanchbox in a while and was still on v10.10 - I took the plunge and went to v12.6.

Things seem to work fine expect when I import a new game and it tries to download images it crashes with the error:

The directory name is invalid.

App:     LaunchBox
Version: 12.6
Type:    System.IO.IOException
Site:    System.String GetTempFileName()
Source:  System.Private.CoreLib

   at System.IO.Path.GetTempFileName()
   at Unbroken.RushDownloader.Download(String url, String destinationPath, Action`2 progressAction, Func`1 getCancelledFunc)
   at Unbroken.LaunchBox.Windows.Processes.ImageDownloader.ProcessQueue(Func`1 isCancelled, String activeImageGroup, Action`2 onIndeterminateUpdate, Action`4 onUpdateAction, Action`2 onGameImageDownloaded)
   at Unbroken.LaunchBox.Windows.Desktop.ImageDownloaderHelp.<>c.CountTraversalSpecification()
   at Unbroken.LaunchBox.Windows.Threading.<>c__DisplayClass0_0.SortCommonException(Object )
   at Unbroken.LaunchBox.Windows.Threading.<>c__DisplayClass0_0.QueryDrivenSpecification()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

I guess I left it too long in between upgrades?

Do I have to start all over again? Hopefully my current setup can be saved...

Thanks in advance for any help or pointers you may be able to give me.