Install Blender and/or Inkscape before running the installer
run Blender and Inkscape once so the installer can find Blender & Inkscape
run the installer
you will need your license file to install ILD Render
the installer will setup windows firewall settings for ILD Render to work
select the options to install (Blender & Inkscape plugins, examples)
Notes
if you're running a custom firewall make sure to enable network traffic for ILD Render / Blender / Inkscape, because the communication between the programs works through network protocols
if the installer doesn't find Blender or inkscape and you installed them run them once and run the installer again
Updating ILD Render
Just run the new installer, it will find your previous installation & update the files