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One way to get around this is to give a free upgrade for people who have bought in the last x months. Apple did this with Snow Leopard, NI did it with Guitar Kontrol RIg 4 and there must be countless others too.



All you do it move the deadline. Then someone a x months plus a few days feels left out. It's a difficult thing to address. There needs to be some upgrade policy for recent buyers. If you announce a release date on a new version, then business comes to a standstill for new customers, because everyone is waiting to get the new version. One way to keep business moving is to offer one free upgrade to customers who purchase and register the current version.