Hello, most browsers no longer support flash, which is why your browser said it was no longer supported. The issue regarding the miniclient login not working, this is because Google is trying to get you to activate two-factor authentication. If this is not something you can do, I would suggest binding your account to an email address, so you c*e that to login. This is possible through the User Center.

https://www.oasgames.com/?a=ucenter&m=login