scythey

Hi guys I bought arma 2 complete edition yesterday (on Steam) installed arma 2 ran it worked fine downloaded arma 2 oa (with BAS and PMC and ACR) and tried running but it needed to install again? Installed it 4+ Times now, it downloads then starts installing but then says stopping and disappears off the download page on steam, don't know else what to do now getting sick . I even tried get the key it self and entering manually but it said invalid code which I was a bit worried about. I have contacted steam support but there taking awhile am just wondering if anyone else knows anything, I've clean the regedit followed what it said to do, run in admin all that on steam still nothing. :( Thanks

hi well i have the complete edition just bought it today but noticed it has the czech republic dlc in and was wondering will i still be able to play online with my friend who bought the anniversary edition which doesnt have the czech republic dlc in or will he have to buy it? thanks