The product comes in full range RGB .exr and HDR formats which are the best for HDR images.
The Exr and HDR formats resolutions:
You will also get a Blend file with Environment texture set up.
Please keep in mind that HDRI is an image, not 3D model.
The HDRI was made using my scene which can be found here:
After purchase you’ll get my full support if needed.
Thank you! Have a nice day! :)