The About tells me that I am running 3.1. Below is a date, but I have no idea which release... 10, 11, 12, 13?
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If you're using the PortableApps.com Platform, just hover over it and it'll tell you. If not, head to the App\AppInfo directory and check out the appinfo.ini file.
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the method John suggested doesn't work, then you can always match the date in the about box to the release date in the beta thread, they should match almost exactly.