Ok, since im probably the first at knowing what goes in RA2 (Robot Arena 2) heres what you will want to do:
1. Go on places like Ebay and find a good copy for a good price that ships to UK (Like I did)
2. When installed, go to:
http://www.gametechmods.comwww.gametechmods.com, then go to downloads section and, then patches and install the RA2 1.3 patch (Winrar needed)
3. For AI packs (technical name for Add-Ons) go to the AI pack section.
There are 2 main popular AI packs out there:
DSL-TC 2.1: If you want Robot Wars and Battlebots replicas, then this is the pack for you.

Starcore 3.0: If you want more of a challenge, then this is the pack for you

My advice is get used to the basic game, or Stock as its technicaly known, then go to AI packs.
If anyone new to RA2 needs any help, feel free to contact me.

Matt
Team Hunt