In the Content tab select Media > iMDL and the Iray materials
pack should show. Make sure to first select "
Pack" and then "All" from the drop down menu to show Installed or not Installed content.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.