To do Your first steps in Rival Species,
just follow the instructions below:

STEP 1: Make sure that Steam and Half Life 1 is installed and updated on Your Computer.

STEP 2: Download the Rival Species version 1.2.2.4
from one of the listed locations:

http://www.rivalspecies.com/files/rspecies_1224_full.exe
provided by http://www.rivalspecies.com
http://garrysmod.de/download-file-84.html
provided by http://garrysmod.de

STEP 3: Install Rival Species.

STEP 4: If You have any questions, refer to this document:
http://www.rivalspecies.com/manpage/index.htm

STEP 5: Either host a game Yourself or try to find one through this link:
www.cstiger.de
You can as well find any available server through Steam.

If You want to host a linux server or dont trust installer files, You can get a zipped full installation with this file:

http://www.rivalspecies.com/files/rspecies_1224_full.zip
provided by http://www.rivalspecies.com