[Nix-dev] How to install specific version of a package?

[Kevin Cox]

If you know the path of the package the easiest way is `nix-env -i
/nix/store/...`.

For installing a package by previous version number I don't think there
is an easy way to do it. (Except for some packages were different
versions are available in nixpkgs). This is partially because "version"
in nix includes all the versions of dependencies and build instructions.

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