I also followed your procedure and was finally able to install all the software provided with the printer. I also use Avast on W8.1.Thank you to post your findings and to share them with others.
Hello,I experience the same problem with a Canon MG5450. I bought this printer a week ago. In my case the install package is [mast-win-mg5400-1_0-mcd.exe] and I tried to install it also on W8.1: I received the same error in french "Une erreur est sur...
