I’m having a similar issue. I updated one of the uipath activity packs and since then have been presented with the uipath registration screen when I run the software. Attempting to reregister the community version leads to a corruption license warning.
I followed these steps UiPath gave to someone experiencing a similar issue - to remove & reinstall - Ver 2019.4.2 after downloading unable to start execution - #5 by loginerror
However I now can’t reinstall. My account isn’t recognised, the ‘forgot password’ link doesn’t seem to do anything. I’ve tried setting up a new account as suggested by @Palaniyappan’s last post, but this just hangs on the ‘signing up’ message. I’m now without UiPath and can’t get it back 
Any assistance would be appreciated 