OK, so just downloaded this and I'm slightly confused. It states that the hdrs can be used in any graphic software, but ALL the files have the .uasset suffix and for the life of me I can't figure out how to use them in Daz.
I was curious so I grabbed it and did some reading. It seems that the damn thing is in an Unreal format. This is supposed to open them.. https://www.gildor.org/en/projects/umodel
So the tool gives me some error about a 'UE4 legacy file not supported'. I think this package was stolen from another hack site somewhere and the sleazebag is just trying to make a buck off of it.
His sales page doesn't say much.
The uploader 'Katy_ModsFire' posts a lot of game stuff and might be familiar with this.
(15 minutes later) An online converter goes to 3% then says it's an unsupported format.