Relocate Logic´s library to primary storage

Hi there, I'd suggest to just download the Sound Library to your internal HD once again. You should be able to do so when launching Logic with your external HD which currently hosts the Sound Library disconnected.

Alternatively, if downloading isn't feasible, you may try to manually copy sound library components (i.e. files / folders) to your internal HD (i.e. replacing the symlinks created when you relocated SL to external with actual folders containing SL content).

Here's the screenshot from the manual indicating default locations for SL files/folders:

No worries, glad to help. Just to add to the above, one way to deal with "not enough disk space" warnings is to download / install SL components one-by-one instead of downloading the whole thing in one go.

Also, take note that when you're trying to reinstall SL right now, Logic (or Sound Library Manager, rather) might be giving you the low disk space warning which does not actually relate to your system HD, but to your external HD (where the SL currently resides).