It seems, each time after the Quickbooks Online is updated I get "502 Bad Gateway error" and have to un and/or re-install the software. How do I address or overcome this?

Thank you for letting us know your experience, karien.

I can help you resolve the error you've encountered when accessing QuickBooks Online (QBO) through Windows Application.

There's an ongoing issue with QuickBooks Online App for Windows. The login screen keeps crashing encounters an error.

Our product team is investigating why the QBO app for Windows isn't working. I suggest contacting our Phone Support Team, so you'll be added to the list of affected users and receive an email notification once we resolve the issue.

Here's how to contact QuickBooks Online Customer Support team. Then, let them add you to Investigation No. 21697.

While they are still working on a fix, I suggest accessing your QBO company using a browser.

That should get you in the right direction. Let me know how it goes. If you have any additional questions or require further clarification about your account, let me know by leaving a comment below. Have a great rest of the day.