EQ accepts suggestions from users for more/different things they want to do with the software. Every once in a while they put out a new version that does more. Either version is a powerful tool.
If you get EQ5 and register it, then when you are ready, you can buy an upgrade to EQ6 for less than the full price of EQ6.
EQ5 can be installed without the internet.
When you get EQ6 you can put it on more than one computer, up to 4. You have to be connected to the internet to install it. After it is on your computer, you don't have to be on the internet to use it.
They have a website if you want to check out the features and other software they have - www.electricquilt.com