To install Music 1 Pro on a new computer for the first time, you must run both the installer and the latest upgrade file.
After you fill and submit the form, you'll receive an email with a link to both the installer and the latest M1 update.
If you are running M1 on multiple computers on a network, you should not run the Installer on the other computers, but you MUST run and unzip the Upgrade file on each of them. It is important that each computer has the very same version/revision number of the M1 exe.
If M1/Pro is already installed on the computer, you need only download and run and unzip the upgrade file.