All versions are detected if you are lucky/unlucky. I use 1.4 and have used that and lower versions for more than a year without getting banned. But i have a lot of friends who have got banned.
You can use Liberation in PM's without getting banned if you disable VAC. But the program will promote itself in the chat unless you buy it. So the other player will be able to see that you hack.
If you don't wanna get banned just don't hack...