Just saw your thread, and it's not too old. Last time I heard about this, i heard that mikelmao (creater) had access to a newer version (5.1.1) so you might be able to get that from him.
I do have version 5.0.2, which you can download here
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However, remember that the codebase is old, messy, probably insecure, you need legacy software to run it (e.g. it uses mysql_* rather than mysqli_ or PDO, so PHP5.6 or something would be required)
Again, I advice you against using it for other than nostalgic reasons or if you just want to test it out.
He also has some obfuscated code that I have no idea what is doing, thought, most is just base64 encoded afaik