Yes, it seems a bit of a mess, doesn't it?
I think the problem you have is partly due to the distribution model (AFAIK distributors BUY their copies from Cloanto, then re-sell them, often months and even years later) coupled with Cloanto clearly not formulating a contingency measure to deal with old copies of AmigaForever 5 being sold by their approved distributors during March and April.
It's a lack of attention to detail, which seems symptomatic of the AmigaForever 6 package overall.