Well here is where it Ended up.
After Exhausting every possible avenue to get the application running It was Uninstalled.
Reinstalling was impossible due to a Windows Store issue, Something on my PC was Corrupted.
After Many hours of trying anything and everything through Microsoft Support, Zendesk Support and some poor girl from accounts (not sure how I ended up with her) it was determined that a full reset of the windows installation was required. This was carried out painlessly this evening and the Sim is no back up and running (well actually it is still loading everything the content manager).
I will have some work to do to get all of my applications and games back up and running but this was the number 1 issue. I expect better stability now as well.
Suffice it to say that none of this should have been necessary. Microsofts way of managing the data for teh Microsoft Store leaves a little (a lot actually) to be desired. There should have been a method to resolve the corrupted store data and get things back up. It would have saved hours of troubleshooting.
Good luck Stay Safe
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