Mod Zombie?

[Yosel of Kolne]

Есть мод на зомби или компания?в ютубе видел ролики, что можно, где играют вдвоём или компания

[Brujolujo]

Its called DayZ. It's on steam but you also need operation arrowhead.

[KOOLLAYDTAC]

I think you only need the base game for this one. It's called The Undead Mod. There is no mp for it though sadly.
https://www.armaholic.com/page.php?id=9207

This one needs OA I believe.
https://www.moddb.com/mods/bobtoms-arma2-missions

You should be able to find some zombie missions on the first site as well too I believe. Other then that if your wanting the online experience then DayZ Mod is your best bet like previously mentioned. Hope this helps some and good luck mate.