Hey @Paul-Marcel, sorry that our FAQ is a little out of date. Local beta versions are compatible with El Capitan anymore. You would need to either update to at least Mac OS 10.13 to use it. Otherwise, you might try installing Local by Flywheel for now but we aren’t making any updates to that version.
Here’s the link to version 3.3.0 - Local by Flywheel 3.3.0