HDRi Maker is an addon for Blender 2.79 and Blender 2.8x
To install there are instructions in the "Read me" file
Requires 46 GB of free space on the hard disk.
Installation instructions are included in the download:
- Want to Expand your HDRI Library?
Do you want to expand your HDRi Maker library? Here you can find 90+ additional backgrounds in EXR format (Compatible with HDRi Maker).
Many are free under Attribution 4.0 International license (CC BY 4.0)
Remember to give credit to the author if you use them for your works: