i get the same problem and ill just paste what i wrote on another forum
so i decided to give pr arma ago on my new rig but pr wont load
it said something about a Chinook so i tried updating arma to find there was a error and it said patch was probably damaged re downloaded from a differnt mirror same deal i even used the downloads from my other pc where arma pr worked but not very well.
so i un installed all of arma (after un installing just oa) and put on both oa and vanilla same deal witht the patching. un install again and go step by step.
i installed just arma 2 vanilla tried to patch to 1.9 from 1.3 (possible) didnt work so i patched to 1.4 (worked) then 1.5 then it didn't work. from the second paragraph i looked at the errors and it comes up with this
Code:
Please be patient. This update may appear to take a long time to complete. It is updating and installing very large data.
ARMA II DVD
ArmA 2: Updating version 1.04 to version 1.05...
Update 1.04-1.05\ADDONS\A10.PBO.BI.BISIGN.UPD cannot be applied, error xdelta3 returned error code: 1
Some error occurred during patch installation.
Patch file is probably dammaged. You may need to download it again.
Error in file ADDONS\air.pbo.bi.bisign, phase 1.
when i first tried using pr it said chinook now it says a10 in the patcher.
i have tried to delete the file, reinstalled many times but nothing works
i have a legit version on dvd i got from eb games aram2 and arma 2 oa (separate disks)
(this could be the problem) it is installed on my 2nd hard drive (500gb hhd) cause my first has 6.5 gb left on it (60gb ssd)
i can launch it with no patches BTW