Step 1: Verify if user has Visio Online Plan 2 license or not. If license is not assigned seek approval and add Visio online Plan 2 license.
Step 2: Login to https://www.office.com/ with users account.
Step 3: Open https://aka.ms/office-install this URL provide the list of available software which can be installed based on the users license.
Step 4: Close any Office related applications like Outlook, Word, etc.
Step 5: Select appropriate version and click install Visio .
Follow the installation wizard and finish the installation.