There are some errors in the old syntax, here is my updated version.
cd "C:\Program Files\National Instruments\NI Package Manager"
nipkg feed-add https://download.ni.com/support/nipkg/products/ni-l/ni-labview-2024-runtime-engine/24.3/released
nipkg feed-add https://download.ni.com/support/nipkg/products/ni-l/ni-labview-2024-runtime-engine/24.3/released-cri...
nipkg update
nipkg search ni-labview
nipkg install ni-labview-2024-runtime-engine:windows_x64=24.3.3.49156-0+f4 -y --accept-eulas
