Found my answer on the "What's New in MediaMonkey 5.0" wiki page:

CD Burning is no longer supported. If needed, you can use MediaMonkey 4 for this (beside lifetime license, MediaMonkey 5.x license is also back compatible with licensing MediaMonkey 4.x).

Sorted!

Hi there,
Been using MM4 for a while now and I must say I really like the program, it has made managing my library a lot easier and the wealth of plug-ins really is fantastic.
I have been considering upgrading to gold for a while now but am unsure if I buy a license do I need to get the MM5 license or the lifetime one?
I’ve used MM5 a bit but definitely prefer 4 so would like to stick with it! I had a search of the forums and the support section but haven’t found an answer.

Cheers, lofirefix