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Knorst

Arma 2 : Operation Arrow Head / Bad Serial Number (Steam)

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Right click on the game in your Library. Select Properties and then do a verify Cache. It should fix it.

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if that don't help then please

1.

exit STEAM client

start STEAMclient via "run as administrator" (in menu by right clicking on the icon)

run the game(s)

2.

restarting computer helped some users (seems like STEAM service writes some values on logoff/logon)

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