Don't know if it works in its present form, but that download is the plugin for Trillian Pro, it is not a full program, hence it is not an executable.
It doesn't matter. The trillian plugin went down at the same time as EQIM.
I wish it was still there, since it was nice to see if friends logged on without actually having to log on to find out. I recall them saying they'd update EQIM to make it work again, but I don't know if that source was official. Considering they abandoned it as soon as they found out people wouldn't pay them (why they thought people would pay for a chat service, when virtually all clients are free is beyond me)