Hi, I purchased this in the Mac App Store in December 2015, plus I have been invited to download beta editions. The email that I received says :-
As usual if you already own Affinity Photo or Affinity Designer this update is completely free, and to thank you for your support we’ve also made the free content available to existing users until 16th November when the special offer ends.
Here’s what you’ll receive along-side this fantastic update:
alanj49 got a reaction from CreativePW in Free Content included with 1.6 ('Till 16th November 2017)