Latest babel breaks with lualatex and amsmath

[Norbert Preining]

You can install a package via tlmgr install --from-file afair.
Also, your can always pull older versions from the tlnet archive at texlive info

-- 
PREINING Norbert                              https://www.preining.info
Fujitsu               +    IFMGA ProGuide    +   TU Wien    +   TeX Live
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Feb 26, 2022 16:38:03 Sergio Callegari <sergio.callegari at gmail.com>:

> Hi,
> 
> It looks like the latest babel breaks compilation with lualatex on documents using amsmath (see https://github.com/latex3/babel/issues/175).
> 
> Babel and amsmath are such important pieces of infrastructure that in case a proper fix cannot land very soon in babel proper, it can be quite important for users to be able to revert to 3.71.
> 
> I have some questions in this regard:
> 
> - Is it possible to download a package and keep it around for installation as one would do, say, for a `deb` or `rpm`. In other words, would it be possible to download something like babel.r62007.tar.lz4 package from somewhere for later install from command line?
> 
> - To make sure that babel.r62007.tar.lz4 that I currently have in the backups does not get accidentally deleted or autodeleted, I am copying it somewhere else. In case it gets deleted is it enough to drop it back to the backup directory or must there also be some reference to it in a database?
> 
> Thanks
> 
> Sergio