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Just so everybody knows -- Opera is aware of the issue:
https://blogs.opera.com/desktop/2023/08/introducing-opera-102/
This is how I fixed it:
That seemed to bring back all my settings, bookmarks, etc.
How is it disabled?:
** If I go to Opera.com and try to download the Windows version is gives me the 102 Setup
** If I go to https://get.geo.opera.com/pub/opera/desktop/ it still lists 102 as available
In my case I always go to the offline installer directory (firewall doesn't allow me to do online install), and today I saw 102 there. So naturally I downloaded and installed it, and BAM -- all of my info gone!!
Luckily I was able to fix it this way:
Very bad of Opera to put 102 out there as Stable with this major issue. Then to post on these boards that it has been removed when it's still there for download ....
@remmachine
In that directory, delete the "opera_gx_splash.exe" file (when you have Opera shut down of course).
That will stop it, but you will need to do it again it Opera updates to a newer version.
It shows up for me on W10. Go to the Control Panel, then Programs and Features, scroll down to Opera, and right-click then Uninstall. Once it started it gave me the checkbox for Delete all Data (it paused there and I had to answer before it continued). Make sure the box is unchecked then click the Uninstall button.
@135mech, @wandi, (and all others):
As I posted above it seemed to work for me. And on the Opera blog they claim that they have disabled auto-update for the time being since so many people are having the problem. So once you go back to 101 it should NOT auto-update (at least according to the Opera folks ....)
@leocg:
I am not talking about auto-update (that does not work for me anyway since I am behind a firewall).
I am talking about 102 still being downloaded through the offline directory or even right from the link on the Opera homepage. If people don't know to read these forums first you end up thinking 102 is "stable" and installing it anyway!
Well I just noticed newer version 102.0.4880.29 on the ftp and offliner installer sites (timestamped 29-Aug-2023 13:41).
Who wants to be a guinea pig??? 
WooHoo - it seems to work!
I installed 102.0.4880.29 over top of 101.0.4853.58 without any problems. It moved all my data and everything works. You still get the silly "O" splash screen and noise, but you can disable that by deleting the "opera_gx_splash.exe" file (but you need to do this every time Opera updates).
Disclaimer -- As I have posted before, I am behind a firewall and use the offline installer. This is what worked for me. I have not tried Opera autoupdate so I don't know if that works or not.
@dbaillieuk01
Have you seen my recent post? There is now a newer 102 version (102.0.4880.29) which seems to work correctly. I know you can get the offline installer directly from here:
https://get.geo.opera.com/pub/opera/desktop/
I don't know about the Opera homepage or autoupdate though ...
Well Opera, I give up ....
I have been an Opera user since a few days after it was released to the U.S. I have sung your praises on numerous occasions and even stuck with you through the move to Chromium (not a good move IMHO). But these latest problems with profile migration are killing me!
I went through all the pains these last few releases, but finally had 102.0.4880.29 working correctly. Then when I updated from .29 to .33 nothing migrated, so I followed the instructions about copying Default data over. That worked good for a few days, and now I saw .40 released. As soon as I upgraded - Bam! - no profile migration. So I went back to the blog post instructions for moving profile data, but this time it didn't work correctly. So no choice but to roll back to Version 101.
So now I have officially rolled back to 101.04843.58 and have all my data. I have synched my Opera account to make sure it all goes to the cloud, but as you know that doesn't capture everything. I have also deleted "opera_gx_splash.exe" to get rid of that annoying startup screen. It looks like I am stuck using 101 for a long time.
Even this one still has issues: "O" Menu button is not rendered correctly, Minimize/Maximize buttons do not work in Win10, you can't drag and drop bookmarks into folders, and a few other things. I have been living with these since they were just inconveniences, but how can you upgrade from 102.xxx.29 to .33 to .40 (all within version 102) and still not have profile migration working correctly. Once you have moved profile data shouldn't all subsequent 102 versions read from the same folders?!?!
Thanks for the suggestion but it was already turned off.
Just for fun I clicked it on, restarted Opera, clicked it off again, another restart. Still didn't change anything.