This question already has an answer here:
texlive 2016 installed on my windows OS, to use
texlive 2017 you need to download it (over then 2.5GO), I think this is a tedious operation every time you want to pass from an old texlive to a recent one.
My question is is there a posibility just to upgrade
texlive 2016 to
texlive 2017without removing, downloading, and installinig the entire texlive?