Download "Opera_103.0.4928.16_Setup_x64.exe" from https://get.geo.opera.com/pub/opera/desktop/103.0.4928.16/win/.

Goto the URL opera://about, take note of the "install" path and close Opera.

Open the Windows task manager and end task on any Opera processes on the processes tab.

Uninstall Opera but don't tell it to delete your data when uninstalling when it asks.

After Opera is uninstalled, delete the install folder as it will remain with a few things in it.

Delete everything in "C:\Windows\temp" and "C:\Users\yourusername\AppData\Local\temp" to get rid of Opera installer temp files.

Launch "Opera_103.0.4928.16_Setup_x64.exe", click "options", uncheck "Import data from default browser", adjust the other options as you like and install.

That should sort things out.