@PrinceToma, Don't worry, if there will happen something with you computer, remember, your collection is in safe, always duplicated: one, which you have on your machine, and the other one in Totem's server. You can check it out, if you go on this website into My Collection. There are all the cards you have. IF something happens, you can redownload them at any time again without any payment.
Edit: "Forever" means as long as there is a Totem... ];-)