AV Arcade Free is a far older version of AV Arcade. AV Arcade has been almost entirely re-written and the free version is not a representation of the paid version.
So you don't have any cash to spare for AV Arcade? Well that's okay because you can grab AV Arcade Free! AV Arcade free is an older version of AV Arcade lacking many of the refinements and features of the paid version. But it is still a great platform for you to start your arcade site on.
Here's just some of the features that are not included in AV Arcade Free:
AJAX Admin panel
AJAX Comments & Ratings
Game feeds from Mochi, Flash Game Distribution and more
Social features like game favourites, avatars and points