I have downloaded and installed HSFX 4.1. My question is should i be able to play on servers that are using 1.2 AAA? IE like Spits Vs 109s?
Spit vs 109s Mods uses UI version 1.2 so no you can't use HSFX 4.1 on that server. To my knowlege nobody is hosting a HSFX 4.1 server.
HSFX it is connected to a server, as well as original SFS, for example as in server UP 1.8 - through a file .rcs