I've just bought a second-handed MacBook Pro (late 2013 - Catalina 10.15.1,) and with the deal it comes with FCP 10.4.4.
For this version, I cannot drop the footage from the Finder to the program, I also cannot import the sound effects (with built-in ) into the timeline. The warning is "not enough disk space" even though I gave FCP full disk access and there are plenty of space in my Mac.
I cannot update it because it was purchased by the previous owner. I don't want to have to purchase it again.