Problem installing Arma 2: OA (steam)

[Problem installing Arma 2: OA (steam)]

My Mcaffee placed the battleye setups and other files from battleye quarantaine because it says that it's a trojan horse. Should I trust these files?

[Problem installing Arma 2: OA (steam)]

I wanted to get back into arma 2 and arma 2:oa and I tried reinstalling it and Arma 2 and the beta version of arma 2:OA are working just fine but I tried downloading Arma 2:OA several times now and when the download is done, it isn't installed on my computer so I can't launch the game, it only gives me the option to install it. Can anyone help me please?

Thanks!

Greets, Lightningkill007