... the other day, for some reason or other, I did an uninstall and reinstall of Opera 11.64. I used Revo Uninstaller for the uninstall as I do for most uninstalls. When it prompts for whether you want to delete the additional files, folders and registry entries that it finds, I was prompted with whether I wanted the "Opera Software" folder deleted. That made me pause and wonder whether that "Opera Software" folder was the very same Opera Software folder where my Opera 20.0.1387.91 was installed. I didn't know right off the bat whether it was possible that there was another "Opera Software" folder within the Opera 11.64 files. So, just to be on the safe side, I opted to not select that "Opera Software" folder to be deleted during the Opera 11.64 uninstall.
Over the years, I've learned (the hard way) to be very careful about using ancillary uninstallers like Revo to remove Opera from my systems where I've got multiple versions of Opera installed. I've also learned to 'custom' install all my Opera versions into uniquely-named folders, rather than the typical default-prompted "*\opera" folder name (eg: I custom-name the folder to something like *\opera1164). There are simply too many ways for confusion between versions otherwise when later uninstalling one of them.
