Having 1.3 and 1.22 installed at the same time...

[Topf]

without problems;
Dunno if this has been posted before (afaik not)
Install Bf2, patch to 1.22, install PRMM 0.3
make a copy of your Bf2 Folder (at 1.22) into the */*/programfiles/EA GAMES/ folder.
Rename this copy anyway you want.
Patch the game (it will only update the installation that is */*/programfiles/EA GAMES/Battlefield 2, the other one will not be affected.
For playing 1.22/[email protected] simpy rename the 1.3 folder (Battlefield 2) to something else and rename the 1.22 folder to "Battlefield 2".
This can be done the other way around.
Now you got a perfectly working method for switching between both versions within 2 secounds.

Thanks to [k]Colonia and Tom@field.

[NiGHTWoLF]

I did this to last week or something and it worked a treat, i was worried punkbuster might kick me but it didnt. I named my new one Battlefield 3 just to stop any confusion and make it easier to edit programs such as xfire and make my shortcuts.