Installation of SUSE Linux 7.3

Dear All, I have serveral questions regarding SUSE 7.3 installation method: 1., Which is the best way to download it from Austria? Please send me some sites. 2., Should I install directly from the web, or download to the harddisk first(if this is available at all, I haven´t checked). I don´t know exactly how it works. 3., Can I upgrade my 7.1 version with 7.3? 4., If I purchase a license in a shop can I get discounts later when I want to upgrade the previous version? I saw 7.3 in the shop, but I should pay the whole price again. Actually, it would be the easiest way, but the most expensive too. Thanks, Regards, Ferenc