thanks.. Is there an official build i should download or just use the latest build?
rjm's advice is sound, but despite that, before installing the latest MC13 build, you should understand that it's still in development. There's no rolling back either as the library version has been incremented. This means that while v13 will restore and upgrade a v12 library, v12 will
not be able to restore a v13 library.
Be sure you have a safe backup of your v12 library for use in the (unlikely) event that you wish to roll back to 12.
Also remember that it's safe to have v12 and v13 installed on the same machine, so, getting an initial feel for 13 should be an easy and painless affair. Having v12 and v13 both running at the same time is
not recommended.
-marko