Latest upgrade - a huge list of errors - I don't know what to do next

Hi. After the latest update , I did it through my dashboard yesterday 2nd Dec, 2020, everything is just a big mess, huge list of errors. As I am not a developer as such, I can’t understand how to fix all this. Everything seems to work, sort of. I can see dashboard and contacts are all there. But when I try to edit my emails, they won’t open for editing. Segments folder won’t open. I tried to empty the cache on cpanel, but I couldn’t find any cache folder any more. I am close to giving up now. Mautic seems to be too complicated to work with. Is there any way to update Mautic via cPanel manually? The automatic option on dashboard never seems to work properly.