You install Fusion in the same way you install other macOS applications.
Installation of Fusion does not modify existing virtual machines.
Prerequisites
Verify that you have the administrator password for your Mac.
Download the Fusion installer file to your Mac. You can obtain the Fusion installer file from the VMware website.
Verify that you have the appropriate license key. For example, if you are using VMware Fusion Pro, you must provide a Fusion Pro license key to activate the Fusion Pro features.
For information about installing Fusion Pro for Horizon FLEX, see the VMware Horizon FLEX Client User Guide.