Sorry to hear that. Looking at your log and crash reports it seems the data corruption error is persisting, and one of the reports appears to be a ‘Broken Connection’ error, which may have been an local connection issue or a backend hiccup 
Unfortunately, as you have exhausted all of our recommended solutions above I’m at a bit of a loss. I’m happy to contact Steam on your behalf and request a refund for you - let me know if this is something you would wish to do.