CATIA V5 is not natively supported on macOS. If running via Boot Camp or a virtual machine, the Windows help server can be installed inside the VM, and localhost works fine.
: If pressing F1 doesn't work after installation, go to Tools > Options > General > Help and use the Browse button to point to your installed documentation folder. Alternative: Online and PDF Resources catia v5 help documentation download
field, enter the path to the installed files (or the URL if using a centralized server). Intratech (Pty) Ltd Alternative Resources CATIA V5 is not natively supported on macOS