No way to update older sites?

Your best bet is to use an older version of the CLI.

The latest 2.x version is 2.38.3 which is linked to CLI version 1.9.x and node version “^8.10.0 || ^10.13.0” (source)
The latest 3.x version is 3.42.8 which is linked to CLI version 1.12.x and node version “^10.13.0 || ^12.10.0 || ^14.15.0” (source)
The latest 4.x version is 4.48.9 which is linked to CLI version 1.17.x and node version “^14.17.0 || ^16.13.0” (source)

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