@Badger52 Solved: I used a generic removal tool I had, and deleted a bunch of folders from old versions of Opera, as well as the Registry entries, and was able to install the new Opera One with no problems.

1 - While updating an older laptop, I was able to install a new Opera One today. 2 - Afterwards, I looked in apps and saw that I also had an old Opera...41.
3 - I tried to uninstall old Opera 41, but PC can't find it, but it did find the newly installed Opera One...and removed it instead.
4 - Now I can't reinstall or update the old Opera 41, as error message says Opera already installed.
5 - Windows shows No Opera installed, but I can boot up the old Opera 41 by going to the .exe file.

Question: How do I clean all the old Opera 41 out?

Thanks to all!

I am having the exact same problem, though my screen goes black, since I am using the DARK theme. I've done several reinstalls, but nothing fixes it. I've been loyal to Opera for decades, but this is making me nutto :(.

It's happening again - can't install the update. The system downloads it and supposedly installs it, and after a few moments I get the notice to update again and again and again, etc. Last time I found a link to download the current product version, and then install it offline. The prob with that is that everything does not transfer perfectly, so I have to go in and reset my Speed Dial page, and a bunch of other things. I really don't want to migrate to some other browser, as I have been using Opera since forever, and want to keep on with it. Any advice out there?