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I'm trying to update my packages on a Mac using TexLive Utility. I get an error message: ``Unable to find a valid update server. Either a network problem exists or the TeX Live version on the server does not match. If this problem persists on further attempts, you may need to try a different repository.''

The repository address is http://mirror.ctan.org/systems/texlive/tlnet.

I tried using a different one (https://mirrors.sjtug.sjtu.edu.cn/ctan/systems/texlive/tlnet/) and I get this message: ``Repository has a different TeX Live version. The repository at https://mirrors.sjtug.sjtu.edu.cn/ctan/systems/texlive/tlnet/ has TeX Live 2021, but you have TeX Live 2020 installed. You need to switch repositories in order to continue.''

I am using TexLive Utility v. 1.49 (2021).

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    That explains it. You have TeX Live 2020 installed. That is frozen and cannot be updated anymore. You will need to install MacTeX 2021 (remember to update it afterwards).
    – daleif
    Aug 10, 2021 at 13:06
  • Sorry, I just realized that I still haven't released a version that knows about the 2020 legacy mirror. The latest beta will let you update TL 2020 to its final state, but as @daleif says, you need to install MacTeX 2021 or TL 2021 to get current packages. Aug 11, 2021 at 2:26
  • I see. So there is no way to use TexLive Utility 2021 without downloading the whole MacTex 2021 distribution?
    – Paul
    Aug 12, 2021 at 5:46

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