I updated our Wordpress from version 4.5.16 to 5.5.3 on a staging site copy. Before that I passivated all the plugins. Then I tried to update X theme using automatic update (one click). First it downloaded the update, removed old, but then finally the process failed saying something like “failed to create folder x”. After this I saw that folder /themes/x was missing. Also X theme was missing from the admin page.
How should I fix this?
A) By installing x theme again (latest version, automatically or manually)? Should I first remove the existing (passivated) Cornerstone plugin? And finally activating it with the license key we have?
B) By copying the missing /themes/x folder back from live site and updating it differently? Perhaps manually, leaving some files in place?