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Our Compositing Packs are sets of video clips and therefore they don't have any project files so you don't need to install them anywhere in particular (that's also why our mInstaller app is only downloading them). All you need to do is extract the downloaded archives and place the folder with the expanded files wherever it's convenient for you.
To use one of the pack's components afterwards, drag & drop the one of your choice over your footage/template, change its position, scale, rotation and blending mode if needed, adjust its opacity and voila!
We also recommend creating a separate event in FCPX for each compositing pack and dragging the pack's folders to that event afterwards – this way you will be able to easily preview and use them at all times (if you are low on disk space, then you might want to make FCPX keep the original media at their original place – you can do that via the Preferences > Import > "Leave files in place" option).