This is pretty well overdue, but for those of you still curious or having trouble installing, everything you need is found in the steam group:
Basically, to install you must extract the files into the game folder. This requires the FULL file as well as the 1.02e patch due to game updates.
Make sure you say yes to all overwrites. If you have trouble getting the ending there is a guide in the forums in the steam group. I will not be answering any comments unless the mod is actually broken.
Thank you for your interest in l4rm.