Currently, all the games after the initial batch come from a single source ( the former includes some from torrents, but probably these are the ones with problems ), namely:
http://www.ibpdownloads.com/ipb/index.php?autocom=arcade&cat=12
These are V2 or V32 ( no idea of the difference ), but any from there can be requested if neither already installed nor subscribers' issues, eg: new ones, ( we do not subscribe, but have a forum account only, entitling 15 downloads each day ). Any similar flash games could be installed if provided, or links to download are given.
Note, only members = forums with IbProArcade installed, can download files there.
There's no way of knowing how many members actually use the Arcade.