Home › Forums › SharewareOnSale Deals Discussion › IObit Driver Booster 4 PRO / Dec 20 2016 › Reply To: IObit Driver Booster 4 PRO / Dec 20 2016 Dec 20, 2016 at 8:02 am #6574575 Quote camntxGuest I cannot activate, I get a message that the activation code that was sent to me has been used for the maximum number of computers and cannot be used. Advise, please.