Hello Peter,
I have registered a €99 product, and I have already claimed two free plugins from the promotion. So the two free product options said "downloaded" the promotions page.
Then a day later, I have registered a €79 product. Another two option to get 2 more free products appeared, but my previous two other option from the €99 which said "downloaded" yesterday disappeared.
I am afraid that the reason for this might be because the €79 has overwritten my entry for the €99, I hope it is not so. I read from the mechanics of the Group Buy Promo that if you purchased two product, you'd have two separate entries.