Once you have the .alf file, you must add it to the software: License Management in Altium Designer
Managed via the Altium cloud; no file download is usually required unless you choose to "roam" (borrow) the license for temporary offline use. altium designer license file download
Log in to the AltiumLive Dashboard using your administrator credentials. Navigate to the tab. Locate your Standalone license and click on its name. Scroll to the bottom of the page and click Activate . Once you have the
Go to the page (available via the User icon in the top right). Once you have the .alf file
Find your Standalone license in the list. Click Activate (or right-click and select Activate).