I am having exactly the same problem (windows 11 latest update). I spend many hours deleting and cleaning all tracks of opera, folders and registries, but unfortunately nothing above 102 seems to work. I tried with 104 and 105 offline installers and they fail, some error related to pak corruption, uninstalling process also fails.
For now the only version that can be installed is 102 and auto update attempts also fail, after each relaunch it remains at 102.

@sectionx27 The problem is not fixed, I am on this update (KB5032288) and I am still facing the same issue. I didn't have time time to send my log file to Opera, I will do it as soon as I can. I just hope they can use the log data to patch this bug or provide a guide that help us to get out of this situation.

@thheblack I think the same, the problems is irrelevant to Windows version or its update. At the end and after many trials, I messed it up so badly that I wasn't even able to install 102. I couldn't make the necessary log file to send the opera developer team, maybe if you can still generate the log you can share it with them and hope for the best.

Finally I downloaded the Opera GX, online installer, and it installed without any problem.

@sectionx27 The problem is not fixed, I am on this update (KB5032288) and I am still facing the same issue. I didn't have time time to send my log file to Opera, I will do it as soon as I can. I just hope they can use the log data to patch this bug or provide a guide that help us to get out of this situation.

@sectionx27 I hope it doesn't come to that. I am in the same situation and I really don't want to restore or reset windows just for the sake of a browser, even if it means I have to remain on 102 forever or switch to another browser.

A user, rijndael9, introduced herself as an Opera engineer and sent me a message asking for my "opera_autoupdate.log" file. Does anybody have any idea about this user? Is it safe? does the log info contain any security sensitive data?

I am having exactly the same problem (windows 11 latest update). I spend many hours deleting and cleaning all tracks of opera, folders and registries, but unfortunately nothing above 102 seems to work. I tried with 104 and 105 offline installers and they fail, some error related to pak corruption, uninstalling process also fails.
For now the only version that can be installed is 102 and auto update attempts also fail, after each relaunch it remains at 102.