ndp481-x86-x64-allos-enu.exe /quiet /norestart With progress UI but no user prompts:

ndp481-x86-x64-allos-enu.exe /passive To suppress automatic reboot:

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.net 4.8.1 Offline Installer Page

ndp481-x86-x64-allos-enu.exe /quiet /norestart With progress UI but no user prompts:

ndp481-x86-x64-allos-enu.exe /passive To suppress automatic reboot: .net 4.8.1 offline installer