My understanding is they limit only the amount of computers you can have it on at one time. I have it and love it. Go to the www.electricquilt.com web site. They have had a lot of questions about this and so they have info on their site on FAQ.
It says 4 activations. But I read also as long as you don't try to reregister, you can load it on as many as you need. But haven't tried. they have forums you can check out and you can send a message to Tech support.