Fail Upgrade

I tried to upgrade the cart version cs 4:02 to 4:01. but it did not work, I tried through the menu upgrade center. When I click install, a few moments out of 404 pages.


We were Unable to find what you were looking for.

The page you have requested can not be found.

Error code: Page Not Found

I've tried to import, use the add on import tool. However, there are error messages. this version not supported