I did have some trouble at first getting the source. Using a git clone resulted in an empty folder and a 5gb pack file in the .git folder.
Subsequently, downloading everything as zip and extracting that gave me some nasty stuff in both winrar and 7zip about file paths being longer than 260 characters.
Eventually I managed to get it to unpack everything by dumping it on my disk root, thereby minimizing the path length. I followed the setup tutorial in the readme.md like a bible and didn’t find any problems. I did get a prompt about overwriting two changed library files, but I remembered somewhere to answer no there, because those were nvidia library files that otherwise would be overwritten by the default unreal library files.
I’m not in my lab right now. Might try it again at another time. I already emailed nvidia dev support about it, so I’m going to wait out a response from them first. Rebuilding the derived data cache for the new engine version took ages.