Hi zabotlama,
Thank you for your insight! I have this particular package available on other stores too, and there I don't charge extra for minor updates (namely, adding 1-5 models to a pack with 100+ models in it already), and when there is a major update or a package deal, buyers pay only the price difference if they own the older package. Here on CGTrader I'm not sure where can I find features like these... If there are none at the moment, I will consider creating a "pay what you want" model with different amount of models in each tier, and the tiers can be bought separately. But this still doesn't solve my problem if a buyer has one of the lower level tier and wishes to upgrade to the higher level tier? Or, should I create a smaller independent package and name it "XY Package Update 1.2" , similar to how games companies offer their DLCs?