Hey Garry just a quick question but i have got the older version of Garry mod (i think either Gm 10) and i have used the beta key for Garry’s mod 13 does that mean i still need to buy Gm 13 even tho i got the older version of Gm???

The beta has finished. The live version is the newest version. If you have an older version it’s either version 9 – which is like 6 years old – or a pirate version.