The VIP system is gone. Few days ago Green Man Gaming introduced a new program for loyal customers. With every purchased game (tagged as XP Offer) special you earn XP. When you earn enough XP, your account level up to Bronze, Silver or Gold status with special benefits: exclusive extra discounts, free games and other special goodies.
These game are currently free for loyal members:
To get a free game, members need to visit tier page they belong to and scroll down to freebie section. Follow this GMG page to learn more about The XP Program. Enjoy!