The newly released MacTeX-2020 requires at least High Sierra, probably for good reasons. Unfortunately I am still on MacOS Sierra (10.12.6) because of other heritage software.
I am happy to install TL2020 directly instead, but I really like MacTeX's version-switching mechanism and use it often.
I understand from TeX Live distribution not showing up in system preferences that I'd only need the symbolic links inside
/Library/TeX/Distributions to get it working. So -- is there an easy way to get or build the missing