[@GAINWARD] 77E83-5E019-E3D18-D4174 and 9DD29-5F077-BC199-E2374 are both valid keys. If you are having trouble, try turning your computer clock back to Dec 29 — sometimes IObit products have time zone problems when registering.
[@Nick Buchko] [@kenneth powers] [@Reg Pellow] [@Roy] [@MULTIDRMA] [@shire] Just updated the download. Please try it now, this updated version should work. If it doesn’t grab it from here and try it: http://www.softpedia.com/get/Tweak/System-Tweak/Advanced-WindowsCare-Professional.shtml
Thanks Ashraf, it worked.
Installed and activated license.
Note – the 1st key was invalid but 2nd key was valid and activated.