Most recent troubleshooting info can be found at BIS Wiki Troubleshooting FAQ
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Please note below the official support information for the particular versions of the game:
Sprocket Version (version from sprocketidea.com)
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Operating on czech working days (usually Mon-Fri), expect response time around 24 hours.
European Version (version from 505 Games)
Official 505 Games contact page
ArmA tech support phone numbers:
UK *** *** *** *** *** *** *** ***0870 600 1698
IRELAND *** *** ***1800 882433
FRANCE *** *** *** ***080554 0282
BELGIUM *** *** ***80080838
German Version (store bought or downloaded version from Metaboli)
Morphicon Support Page
Official German forum
(use if you have any problems buying ArmA from Metaboli).
Czech Version (store bought or downloaded version from Sprocket)
Czech support forums
At this moment in time, the BIS troubleshooting forum is not an official means of support, you're welcome to post your problems here and perhaps you can help each other out but for official support you should use the above information.
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