1. Download GTA Alien City HERE
2. Install it on a clean GTA SA
3. Check if your game works on Single Player
4. Get GTA:Alien City MP Client from here
5. Copy everything from GTA_Alien_City_MP_Client folder to GTA SA folder
6. Run samp.exe
7. Join 77.162.16.18:8901
8. Have fun
I will release the server later...