Originally Posted by epzminion
The Metamod version should not matter. You don't actually even need to have MM:S installed to load it. Since it isn't being loaded, my guess is the files aren't installed in the correct locations.
Make sure you have tickrate_enabler_l4d1.vdf in your addons folder. If you placed it inside your metamod folder, move it out of there and put it back into the base addons folder where the metamod.vdf file is.
The way the vdf is set up, the tickrate_enabler.dll file must be in a subdirectory of addons named tickrate_enabler.
Double-check both of those files and see if it fixes the problem.
I'll update with results, but to be clear, is the l4d1 file needed for a L4D2 server, or for L4D1 servers only? I just assumed the separate versions were for separate games.