The creators of one of them often host events where people join to play this game on a set day and time. Today one of those events took place. Here are the statistics:
Here's the link to the official website - http://crymp.net/ You can find everything you need to play there (except for the game)
I suggest you choose the Steam/Origin version of the patch, because my friend who has a DVD version downloaded the DVD patch and it didn't work, while the other one works well.
Hope you will join for the next event! (the date will be shown on the website)