CLIs before 0.9.9 resolve /releases/latest for menubar --force, which can
point at a CLI-only release with no menubar asset, so the update they run
installs nothing. The update dialog and performUpdate now detect an
installed CLI older than the installer fix (909efcf, first shipped in
0.9.9) and direct the user to upgrade the CLI first, with the exact
command, instead of suggesting a command that cannot work. Unknown CLI
versions are not flagged.
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