What I didn't do was to ckick install on arma2 and arma2 OA' date=' and after doing that I could start the conversion process. Starting the game up it threw me a bunch of error messages a,bout missing things etc. and the UI was completely borked. I couldn't manage to load any of the IF content, either as missions or in the editor, and eventually the game froze. Doh!
Sounds like my experience.