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If you have a recent implementation, it should already come with ASDF 3 or later. If you need a more recent version than is provided, we recommend you simply upgrade ASDF by installing a recent version in a path configured in your source-registry. See Upgrading ASDF.
If you have an old implementation that does not provide ASDF 3, we recommend you replace your implementation’s ASDF. See Replacing your implementation's ASDF.