In the download section it says: "Requirements: macOS 11 or later (macOS 10.14 when building from sources)"*
But if i remember correctly, there was some discussion on GitHub concerning this topic - so this should be answered by @ubruhin
Just to be sure: if you are on an intel machine - you don’t try to install the ARM Version of LibrePCB, right?
Printer:
I can confirm that there were printer issues with LibrePCB 1.0 on macOS which were solved with V.1.1. See here No printer found (macOS)