I tried to install the "custom certificate" plugin, but the mysql version in the server is lower that that is required by the plugin, and because all the conditions are not met, moodle is stuck in the screen where is checks for all the conditions before installing the plugin. even if I go back and click on "cancel" and reload the page, the same screen appears.
I also tried to delete the cache folder but with no success. How do i cancel the current upgrade.