Sorry to hear you are experiencing issues after up-grading your zencart software. I understand this type of thing can be frustrating.
Here is a link to our article on troubleshooting 500 errors.
I looked over the site and am getting a blank screen, what is the exact error you are receiving?
I see 2 zc-admin folders: zcadmin, and zc-admin. How did you perform the upgrade, was it done manually by uploading files, or via softaculous?
Also, what was the last thing you were working on before this issue occurred?
|Email:||support@WebHostingHub.com||Ticket:||Submit a Support Ticket|
|Chat:||Click To Chat Now|