You need to install the version of the program that corresponds to the license you have. If you do not know the version, you may need to contact the support team: https://www.nch.com.au/support/
If you want to transfer the data from one computer to another, you need to back up the data on the old machine: click Tools > Backup Data... > select a backup option > click Backup. To restore on the new one: click Tools > Restore Data