I've gone thru that entire thread and this makes things the easiest for the denoiser...

Go here and read the instructions. It has all links (for the denoisers) and the drag and drop to drop your images on. Good luck and sorry for any confusion (heck, even I was confused...lol). These denoisers work on pretty grainy images (with varying degrees of success) so test them out on how grainy you can get away with. You might be able to cut your render times way down and then just denoise.

Back to your regularly scheduled thread....

Laurie