Hello, thank you for the response.
Windows 10
Front version : 66.0.3515.103
Current version : 67.0.3575.31
Installation : C:\Users\miche\AppData\Local\Programs\Opera
Profil : C:\Users\miche\AppData\Roaming\Opera Software\Opera Stable
Cache : C:\Users\miche\AppData\Local\Opera Software\Opera Stable
I found in the directory "Programs\Opera multiple files .old : "launcher.exe.1582629659.old"
As well as several directories with the number of the different versions.
Can we use them to restart in an earlier version.