I always have the same question if I have a previous version:
1. Should I uninstall the new over the old?
2. Should I uninstall the old version first?
(Sometimes it doesn’t matter, new version will uninstall old for me)
Sometimes the only problem would be having old files left over that take up space or maybe cause other problems.
I’ve had problems receiving offer-completion emails from O&O in the past using my normal email address (though not when they just send me a regular email), but have always succeeded when using a gmail address (they don’t seem to care if you initially use your normal email address here at SoS but then use a gmail address when completing their registration page).