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Each control plane expects the CLI version that matches its own (see Choosing a CLI version). If you need an older version of the CLI, for example to use a Nuon BYOC control plane that is not on the latest release, you can install it alongside the latest release and switch between them. This guide uses 0.19.1250 as the older version.

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With Homebrew

Homebrew installs the latest release as nuon and as a versioned formula, nuonco/tap/nuon@<version>. You can install multiple versions, but only one can be linked as nuon at a time, so you switch by unlinking one and linking the other.
If you also installed the CLI with the install script or by hand, that copy (often ~/bin/nuon) may come before Homebrew’s on your PATH, and running nuon keeps calling it no matter which formula is linked. Run which -a nuon to see every nuon on your PATH. Remove the other copies, or put Homebrew’s bin directory first.Your shell also remembers where it last found nuon, so after switching it can keep running another copy even when Homebrew’s comes first. Run hash -r (or rehash in zsh), or open a new shell.

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Install an older version

Unlink the latest release, then install the older version. It is linked as nuon when the install finishes:

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Switch back to the latest release

Unlink both versions, then link the latest release and upgrade it in case a new release has come out since you last used it. Unlinking both works whichever version is linked now:

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Switch to the older version

Run nuon version after switching to confirm which version is linked.

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Replace the older version

When the control plane you use the older version with is upgraded, install the formula for its new version and remove the old one. For example, after an upgrade to 0.19.1260:

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Side by side without Homebrew

To run versions side by side instead of switching, download each version’s binary under its own name. Binaries are published at https://nuon-artifacts.s3.us-west-2.amazonaws.com/cli/<version>/nuon_<platform> (see Manual Binary Download for platforms). This example works out your platform, such as darwin_arm64 or linux_amd64, and saves the binary to ~/bin, which must exist and be on your PATH:
Keep nuon itself as the version you use most, for example the latest release from Homebrew.

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Keep each control plane’s login separate

The CLI stores its API URL, token, and selected org in ~/.nuon. When you switch between control planes, give each one its own config file with --config (-C) or NUON_CONFIG_FILE, so logging in to one does not sign you out of the other. For Nuon Cloud, use nuon with the default config file:
For a Nuon BYOC control plane, use its CLI version with its own config file:
A shell alias keeps the pair together:

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In CI

The Nuon GitHub Action installs the version your control plane reports, so each workflow gets the right CLI for its api_url without extra setup. In other CI systems, use the install script with NUON_VERSION.