Nightly Builds: Question re: Downloading the required files

Just two simple questions to ensure I get the correct Nightly Build files the first time.
(I’d like to try the nightly builds, because I enjoy testing the “latest and greatest” and I’d prefer not to report an issue that has already been solved.)

Under the Windows Nightly Builds there are two sub-directories: “master” and “Krypton”.
The filenames of the contents do not seem to reflect the variant of Kodi.
Are the ones in “master” ongoing Jarvis patches and the ones under “Krypton” the Krypton patches or is the “master” directory just another configuration branch for Krypton?

I also noted that one should download a “.pdb” file with a nightly Windows build, yet I don’t see any such files in the noted directories.
Are they located somewhere else?