You woke up in an apartment high-rise building. You don't remember anything, even your name. You have deep cuts all over your body... you are bleeding heavily. On the floor and walls is lot of blood, obviously, not only yours. You need to find something to sew up the wounds, and then try to understand why this nightmare is going on...
This patch fixes most issues related to engine branch incompatibility and is designed to run using the latest "Beta" of Source SDK Base 2013 Singleplayer...
Need to be registred at the steam-account HL2 (or if you have only EP1, just change in gameinfo.txt app id 380)