You can upgrade an installed version. Suse normally installs itself on 3 partitions, swap (memory swap space), root (where the os and major programs live), and home (where your personal data and settings are). By telling the installer not to format home you can preserve your personal data and settings.
If this is a totally new install and you want to preserve an existing OS ie Windows. You will need to adjust the partitions on the hard drive to allow a free space for the new OS to install to. I recommend at least 30 gig for a loaded Linux distribution like Suse. There are smaller distros that would need less as a minimum. This will require a program to adjust the size of the existing Windows partition. Normally I'd say use gparted but that requires a working CD/DVD. There a numerous Window based partition managers such as Partition Magic which you may be able to run directly from Windows.
Normally this all is pretty straight forward but you have a major complication in that you say you do not have a working CD/DVD burner/player.
As always if you are adjusting partitions or installing new OS you should always backup any important data just in case something goes wrong.
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