What about the mod? (Grand Theft Auto: San Andreas)

Hello comrades in the subculture. I appeal to knowledgeable people with a request.
I really want to completely go through the plot of the GTA: San Anderius mod, He's Alien City. It is popular, I am sure many of you have heard of it.
What, in fact, is the problem. Is there, as is the case with Cretacious Runner, immediately a game with a pre-installed mod?
I don’t understand why this is happening, I’m in the community and geeks in general, and GTA in particular, not a year or two, but all the time something goes wrong with the mod. Found a completely clean version of GTA: CA - does not start. Or they do not save the save ... In general, one after the other. I am almost desperate, that's why I am applying.
If anyone has any information about this, or even a game with a mod, let me know somehow. I'll be very thankful.
Thanks in advance, comrades.