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Actually I think both numbers refers to server version. You can get your version from arma2oa.exe file version. If "Required: X.XX" is in red, that means there is mismatch between your and server version. Try reinstalling latest patch ( Arma2.com ).
Edit: This is a reply to Mavis130, I thought I hit reply-to :D
Are you sure you are using same Arma2 version? Latest patch 1.59