Buy the best you can afford applies to everything. EQ5 is a great design program. EQ 6 adds more features. EQ7 made the features more user friendly plus added the picture tracing/importing. You can have EQ7 installed on two computers at a time, unlimited installations but only on two computers. Doesn't matter what two computers. You install it online so the computers you are installing it on are registered to that version. You can install it on a different computer or a new computer any time. I know two guild members that split the cost of EQ7 and that way it can be on each of their computers. It works fine that way, but belongs to only the registered buyer.