If an upgrade is failing because port 443 became occupied after your initial install, you can change Veeam's assigned ports via the Windows Registry. Open regedit as an administrator.
: Look at the rightmost column for the Process Identifier (PID) (e.g., 1234). Find the application name : Open Task Manager (Ctrl+Shift+Esc). If an upgrade is failing because port 443
If Internet Information Services (IIS) is occupying the port: If an upgrade is failing because port 443
netstat -aon | findstr :443