How to download all Noto fonts
Solution 1:
The place you want to go is the noto-fonts repository on Github. The latest zipped-up release is from December 6, 2020. (This is also where they take the bug reports)
Updates to individual fonts, and occasionally new fonts for scripts not previously covered, occur every few weeks. Probably the best way to keep up with them is to install the GitHub Desktop application and add the noto-fonts repository (help page). This creates a copy of noto-fonts on your computer that you can keep up to date.