Considering purchase.
Hello, I'm using the free trial of WindowBlinds, and I'm considering buying the full version, but I'm wondering, if I upgrade to the $20 version now, can I upgrade that to the $50 version later as an upgrade? As in, if I buy the $20 version now, will it only cost me $30 to upgrade? Because I can't justify spending $30 more dollars when I'm not sure that I need the added functionality, but I don't want to get screwed later if I find out that I want more than the $20 version.
If I can't upgrade later at a reduced price, I don't think I'm going to make a purchase at all and just stop using it after the 30 day trial runs out, which is fairly dissappointing because it is a really cool program.