This situation just got bizarre.
I had given up on trying to restore opera. I just started fresh. Started adding bookmarks, extensions, etc.
Everything was working fine. Then today I was browsing and when a new tab tried to open I received a message that opera was out of memory. I don't know if this was legit or not. I closed the tab and then exited. Then I ran ccleaner.
When I reopened opera it did not go back to what it had been today. Instead it reverted to where it was prior to everything being reset.
All of the tabs that had been open, all bookmarks, all extensions. And all history was there ending at the time and date that the problem occurred. None of the history between then and now was present. It's as though I closed opera that day and never reopened it until now. And like between then and now had been using an entirely different browser that is now gone from my computer.
Also, when the new old browser appeared the open tab showing that opera had been updated to version 103.0.4928.26.
WTF?

Earlier today while not using opera I received a pop up re. using opera vpn.
I closed it and the browser opened. When it did all of my info. was gone. Tabs, bookmarks and history.
I do not understand the fixes that have been posted. Would it be possible for someone to post step by step instructions?
Thanks.