Hi Vincent - at the moment you need a v2 license to use the OSX beta. That's the same as with the v3 beta release.

But if you have v1 you can purchase the v2 upgrade license instead of the v2 full version license to get v2.

Within another month or so I'll release some kind of public trial version of the OSX version that won't require any license at all, so if you can wait for a little bit you'll be able to use that version to test it without purchasing anything new at all.

- Michael