Kindly follow the below step to transfer Sage UBS from old main pc to new main pc.
1. Please make sure you have done backup for all the active company in your Sage UBS. Please refer the below link on how to Backup & Restore
2. Deactivate license(Login Sage UBS > Control Panel > Manage License > License Wizard > Deactivate license)
3. Download and Install Sage UBS from the below link in the new pc. Kindly refer below link to the Product download.
4. Activate the license in the new main pc(login Sage UBS > Control Panel > Manage Licence > License Wizard > Activate New license > Key in MYAPP ID and Activation Code to activate the license)
5. Create New Company > Open New Company > Restore the company data using the backup file.