I’ve broken my Omeka Classic (ver. 2.5) site, probably by upgrading the server to PHP 7.4.11 recently.
Rather than the expected page(s), I get a screen full of PHP errors (i.e., Deprecated: array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead …).
I know I need to upgrade to Classic v. 2.7.1 and I want to do that. I found the upgrade instructions and believe I understand them. But they are predicated on my being able to access the Admin screen to do things like turn off the plugins and check to see if my database needs an update before proceeding.
How do I get there, please? I hope this is easy and I’m just being dim.