That might try to create Duplicate Fonts in Font Book.app. The MacOS does not allow this.

User Library fonts are normally installed only on Macs where the User does not have Admin privileges. This has been the norm for at least ten years, now.


BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5