Gmail Account Unavailable

That did not help any other suggestions

Attached

Authentication appears to simply be failing:

14:47:32 C: D1 AUTHENTICATE XOAUTH2 ••••••••••  
14:47:33 S: + eyJzdGF0dXMiOiI0MDAiLCJzY2hlbWVzIjoiQmVhcmVyIiwic2NvcGUiOiJodHRwczovL21haWwuZ29vZ2xlLmNvbS8ifQ==  
14:47:33 C:  
14:47:33 S: D1 NO [AUTHENTICATIONFAILED] Invalid credentials (Failure)  
14:47:33 Error: Server response: “D1 NO [AUTHENTICATIONFAILED] Invalid credentials (Failure)”. Command attempted: “D1 AUTHENTICATE XOAUTH2 ••••••••••”.  
14:47:33 Error: OAUTH2 error is {"status":"400","schemes":"Bearer","scope":"https://mail.google.com/"}

Did you verify that you have r5300 of MailMate?

Are you asked to authenticate the account (within a few minutes of it failing)?

I have 5263. When I check for updates it says I have the most current version. No I am not asked to authenticate

Ok, then you missed a detail in what I wrote above: Hold down ⌥ when clicking “Check Now” in the Software Update preferences pane.

The ⌥ key is also known as alt/option.

I tried when I hold down the alt key I cannot click on the check now button for some reason. Can I just download the new vision from the website and copy over the old app file?

That's very strange, but here you go: http://updates.mailmate-app.com/archives/MailMate_r5300.tbz

That worked. Thank you. By the way I still can't update with I hold down the option key