I deleted imassages and I can't install it again

Hello
I deleted imassages and I can't install it again
the only version that i found avalable on the web is "beta" and it says that i can't install beta on my mac
so how can i get it back?

The only way to reinstall Messages on a Mac running Mountaiin Lion is to restore OS X using OS X Recovery
OS X Recovery requires a high speed broadband connection.
Backup all data first before restoring OS X just in case.

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