1. The Official Legacy Route
Go to Control Panel -> Options -> Directories. Ensure the LBR path points to C:\Program Files (x86)\EAGLE-7.5.0\lbr . Then click "Update All Libraries." eagle pcb design software version 750 free best download
The default library in V7.5.0 is missing many modern parts (ESP32-S3, USB-C connectors). eagle pcb design software version 750 free best download