No sound effects on FCPX free trial

Hi!

I've had the free trial for a while now, and I've had no problems really, until today. I went to finish editing my video, and the sound effects were missing. I did just get a new computer, and I haven't migrated from my last one so I started fresh. I have tried quitting final cut and reopening several times, I've also tried restarting my computer a few times, but nothing works and the sound effects are still missing. I've seen people download something called FCPContents or something similar, but when I try to do that it can't find FCP on any disks, so I'm guessing it doesn't work with the free trial.

Any help is much appreciated!