Software distributed on CD or DVD sometimes requires it to be on the media to install or otherwise work. You can distribute the content virtually as an *.iso file, and then mount that file so the OS thinks it's an actual CD or DVD.
Windows
Windows 8 or 10 have this cabability built in.
In Chemistry IT, we tend to use the free utililty
http://www.howtogeek.com/howto/windows-vista/mount-an-iso-image-in-windows-vista/
Virtual CloneDrive
https://www.redfox.bz/en/download.html