For a couple of friends:
HOW I INSTALLED ARMA 2 FREE - OPERATION ARROWHEAD - DAYZ
1) Downloaded
Arma 2 Free, installed it(Bohemia interactive/Arma2), ran it once, no issues.
2) Downloaded
OA from Amazon, installed it(Bohemia interactive/OA), ran it once, no issues.
3) Downloaded
Arma 2 OA 1.6 patch, installed it, ran it once, no issues.
4) Downloaded
worrom.com app, installed, had to correct OA file path, finished downloading dayz by itself.
5) Created a shortcut for BohemiaInteractive/OA/arma2oa.exe, added " -mod=@dayz -nosplash"(no quotes) after the quotes in the target field of the shortcut properties.
6) Ran it once, got many errors, googled them, copied Addons folder from the Arma2Free folder into the OA folder.
7) ???
8) PROFIT!!!