rocketbucket said:
Thanks! dism /online /add-package /packagepath:E:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab worked for me!
Ah, the solution! Including the file name "microsoft-windows-netfx3-ondemand-package.cab" was the key to make it work for me. All the other DISM variants failed with similar errors. Adding the filename made it work. THANK YOU! THANK YOU!!