FCP X Trial 10.4.8 supplemental content - qualifying copy?

Hey,

Have the trial version 10.4.8 of FCP X and wanting to install the supplemental content (i.e. fcp x sound effects).

Installed the FCP X 'Download Additional Content', that gave a file update of 6.2mb (just additional video codec, where 'more info' did not provide any reference to FCP X sound effects).

No folder is created for 'Final Cut Pro Sound Effects' in the Library\Audio\Apple Loops\Apple.

The FCP X sound effects package, from an App Store link, however displays the following message when trying to install the package:

Final Cut Pro X Supplemental Content can't be installed on this disk. A qualifying copy of Final Cut Pro was not found.

The library for my current work is on an external disk, however the FCP X is installed on my internal Mac (OS) HD.

Perhaps the trial version does not allow the sound effects to be installed?

Cheers