The USB drive contains a generic EFI folder. To make the system boot without the USB:
: You will need a flash drive with at least 16GB of capacity. olarila catalina 10157 download full
Many professional audio and video plugins (Pro Tools, Logic Pro X older versions, Adobe CC 2021) run flawlessly on Catalina. Newer OS versions often break legacy software. The USB drive contains a generic EFI folder