Google Password problem Windoes 10

After years of using the free EM Client on Windows 10 the software has suddenly started to ask for a password after startup. Message "Server says Invalid credentials (Failure)
I am using Google and Em Client 8.2 1473 (04b618f). I have reinstalled and the problem persists.
However I have successfully installed and started using the version on my laptop.

Problem solved. Downloaded new Free EM Client and installed on an alternate device.
Backup up the new database and restored this dataset onto the original/old application .
Seems the original database was corrupt.