How to import the asset:
- Unpack the .zip-file you downloaded from the site
- Go into the destination project and click on "File" > "Append" , then navigate to the folder you unpacked it into
- In there go to "blend" > "lamps.blend" > "Groups" and append one of the 5 groups.
All textures/HDRs in this pack are either self-made or created by another person who licensed them under the CC0 license.