Hi Herbert,
Each program is independent of the other so this means that you would need to set up this new computer as the old computer was set up. You will need to redownload and install the catalogs you use to the new computer.
By default, your design files are saved locally to the computer you use. They are located in Documents\2020 Files. To open your designs on the new computer, you can set up a One Drive, Drop Box, or Google Drive and connect both computers together so you can access your designs on either systems.
Regards,
Kris