Procedure
Install Elixir and Erlang/OTP
Install Elixir (with matching Erlang/OTP) via the official elixir-lang.org install script or package manager, put bins on PATH, then verify with elixir -v.
Step 1
Install from https://elixir-lang.org/install/ . Fastest cross-platform: curl -fsSO https://elixir-lang.org/install.sh && sh install.sh elixir@1.20.3 otp@28.4 (or newer versions listed on that page), then export PATH to include ~/.elixir-install/installs/otp/.../bin and elixir/.../bin. Alternatives: macOS brew install elixir; Windows Scoop/Chocolatey or the Windows installers; Linux distro packages or asdf/mise version managers.
Step 2
Persist PATH in your shell profile if you used the install script, then open a new terminal.
Step 3
elixir -v
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