I do not need a solution (just sharing information)
I have NEVER had so many installations issues with SAV or SEP until version 12.1.2015 2015 came along. It started out well, but I have seen it roll back for no reason, NOT install at all and TOTALLY misread the O/S. If I installed it on a PC that has W7 64 Bit, it detects it as a Windows Vista machine. Does anyone even USE Vista any longer? In same cases I had to put 11.x clients back on to get SOME degree of protection.
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