Here you can order AppGameKit Classic, add-on products or save by choosing a bundle deal
You can also send AppGameKit Classic and any add-on products as a gift to someone when reviewing your order on the checkout page.
Please ensure your system meets the minimum requirements before purchasing.
(note that the MEGA Pack is made up of Classic DLCs so check before you choose to purchase)
However... if you are buying AppGameKit Studio DLCs or packs with Steam keys you will need to own both AppGameKit Studio and AppGameKit Classic for the Steam downloads to work