Hi stevenjcee
same here on Mac.

so I tried this and it worked for me. ymmv

1. renamed Opera Beta.app to "Bad Opera Beta.app" app (in apps dir)
   removed shortcut from desktop

2. downloaded fresh offline Opera Beta dmg from Opera.com

3. installed fresh Opera Beta package offline

4. opened fresh Opera Beta app and.... lucky! All my data was preserved
   including my bookmarks, settings, plugins! I went through settings to make sure it was what I wanted.

Then I renamed the new app to "Opera Beta 68" just for reference

don't know why this worked .. but it did for me. whew!
Newbie