I get an unhandled error "input string was not in a correct format" when I try to run the upgrade utililty. It appears when the tool loads up, before I choose my project. I've tried in two different pc's - same error. If I continue I can select my project but I cannot select version to upgrade to (the dropdown isnt visible), and when I click to upgrade it gives me error message to select version number.

Can I upgrade manually?