Some companies give you a years worth of upgades with purchase - e.g. if I bought 3.4 in December I could get 4.0 when it is released if it is released within one year of the initial purchase. Some companies only support upgrades within the same version e.g. I buy 3.4 I can download 3.5, 3.6 but can't download a full registered version of 4.0.

I can't seem to find their policy on their website. Can someone please send me a link to their official upgrade policy? I can find upgrades from other products but not their policy on their own product.