I too would be interested in what Xara says about installing Xara Designer Pro V20 on Windows 7 Professional 64 bit. I've also tried installing it and came up with the Authentication error message 12157 and wouldn't go beyond. Daniel, I understand your concern about running unsupported versions of Windows but almost everything I own in my life is unsupported, my 36 yr old Toyota Tercel 4WD 6 speed wagon with the 40 km/hr rubber bumpers, my 34 yr old Cannondale hybrid bicycle with super wide ratio 21 speeds, my 5 yr old Keen Gypsum II MID WP hiking boots which are way more flexible and comfortable than any of the new boots Keen makes, my 13 year old Toshiba Qosmio X500 laptop with 2 HDD and 18.4 inch full HD screen which is still super fast, and I'm running Windows 7 Professional 64 bit still on 5 of my computers because I can't afford to pay the $3,000 yearly subscriptions to run new programs and I really like this old stuff rather than the new and made worse ones. Many modern developments are seriously missing features which make them almost impossible to use or prices that are not affordable for part time use. And so many people take chances on reliability and safety because of this dilemma. Windows 10/11 does not have an XP Mode to run my $15,000 of programs that are up to 35 years old. It's not clear how practical the new Windows 11 virtual machines are and they have the same safety dilemma. Does it make sense to put everything we buy like houses, cars, computers, cellphones, and appliances in the junk pile when they reach 3 years old? There has to be a solution for keeping many old things going.