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This question already has an answer here:

I have 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?

marked as duplicate by David Carlisle, Henri Menke, egreg, user36296, user31729 Jun 4 '17 at 21:59

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    no it is the same every year, install a new texlive. – David Carlisle Jun 4 '17 at 19:55
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    No way..... :-( – Salim Bou Jun 4 '17 at 21:22
  • No one forces you to upgrade, if you would rather stay with texlive 2016 that is fine. – David Carlisle Jun 4 '17 at 21:25
  • All too often the structure of TeX Live changes from year to year so there is no simple one to one structure to update. – Herb Schulz Jun 5 '17 at 1:25
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You do not have to remove the previous year TeX live installation to install the next one.

Nevertheless, upgrade is not possible. as detailed here, which I invite you to look at, basically it's stated that upgrades could be kind of risky, this is way there is not a supported way to do so and so the "safe way" is to do a fresh install.

Think of the possibility of corruption of the packages if something goes wrong, the hours invested in upgrading scripts and the pain of a possible rollback. The pain is removed, and all of those hours are invested somewhere else in the LaTeX development area.

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