Should just be able to backup the database/settings with the backup tool, then install the v6 program on the new computer.
If you don't have the installation program then you will have to try to obtain that from the software vendor.
I know that some companies like that don't like to offer support for old versions and think you should rush out to buy the new version from them.
Unfortunately the software you are using is not that common, if it was quickbooks or something a little more mainstream there would be a decent amount of people that are experienced in that software and could help you further. So if you need further assistance you will have to deal with the software vendor.