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@dbaillieuk01: Ha! In desperation I've just installed an older 101 version and recovered my bookmarks and history, although not my workspace tabs. I had previously done this a couple of days ago, and then updated to a 102 version, which had held steady for about a day and which then lost all my data again. I have now exported and saved my bookmarks and history and will transfer them to another browser. I simply don't trust Opera anymore, which is a real shame.
@leocg Thank you for posting this. It's about time Opera provided an explanation and instructions. Unfortunately their instructions have not worked for me. I have posted details of this under the blogpost and hope they will respond, but I'm not holding out much hope at this stage.
I am one of Opera's users who has lost everything - bookmarks, history, workspace tabs. This is a disaster. I have just tried to go through the steps detailed above, but after I typed in opera://about, it showed that the version I currently have - and which has wiped my data completely - is already newer than 102.0.4880.16 (it is 102.0.4880.29). It automatically checked for updates and then gave me an error message: "an error occurred while checking for updates". Please, Opera, can you help me to recover all the data that I have entrusted with you over the years and which has just disappeared.
@dbaillieuk01 After running the new version of Opera and recovering my history and bookmarks - but not my workspace tabs - I switched on my laptop this morning and found that everything had disappeared again. I am hoping that I will find a way to retrieve my history and bookmarks so that I can make copies of them. But either way, I am finished with Opera. This has eaten so much of my time and energy, not to mention all my data and work. How could I ever trust such an organisation again?
@sklunk Thank you, but I've tried that as well. The people on this forum are trying so hard to help each other. If only Opera would do the same.
@manuel60 Thank you anyway. We really need Opera to take ownership of these problems and help us all to recover our lost data.
@manuel60 Hmm. I installed the older version you recommended but I still have empty workspaces.
@manuel60 Thank you. I've had partial success only. My bookmarks and workspaces are back, but none of my workspaces have any of their tabs. I tried Ctrl - Shift - T to restore the tabs but that didn't work. So I have five empty workspaces, which means I have still lost a huge amount of data. If anyone has any knowledge of how to restore the lost tabs please let me know. Thanks.
@manuel60 I'm glad to hear that this worked for you. Were you able to recover your lost data? How did you do this? Thank you.
Opera, if you are listening to your users, please give us official instructions re how to regain our bookmarks, history, workspaces, and tabs. Some very helpful Opera users have posted various ways to recover this lost data, but the response from users who have tried these methods has been mixed: it appears to have worked for some people but not others. We need Opera to clarify exactly what we have to do to recover all the data which we have trusted with you, and which disappeared with your latest update. Please do not ignore us!
@dbaillieuk01 I keep hoping Opera is working frantically to set this right and that they will officially let us know what to do soon. 
@silvarang Thank you, but my profile path lists: ...AppData\Roaming\Opera Software\Opera Stable\Default
There is nothing that does not say 'Default'.
When I go to that address it does appear to have a lot of data listed, but as none of my bookmarks, workspaces etc actually show up when I run Opera since the update, I don't trust that this is the answer to my problems.
Does anyone have any light they can shine on this? Many thanks.
@sklunk Thank you for this, but I can't see a way to uninstall Opera 102 without deleting all the data. On my Windows 10 system there is no "delete all data" box to tick or untick. At least I cannot see one.
The new version of Opera has completely wiped out my existing workspaces, and their many carefully chosen tabs, as well as my bookmarks and history. Please tell me there is some way to recover these. I know the new system works differently so I won't be able to reinstate them as they were, but at least having a list of them would mean we could avert disaster. Because this really is disastrous. I can't believe Opera has wiped everything out that I had trusted them with.