@airin42 You can try data recovery method. With such software like Recuva, Disk Drill, MiniTool Power Data Recovery, Wondershare Recoverit, R-Studio, etc., you can try to recover an older version of your 'History' file from your profile folder - %AppData%\Opera Software\Opera Stable
Not sure if this will help in your case. It's better to have already installed them. Or, if installing now, try to install them on another disk (partition). A portable data recovery tool is preferably.
