Final Cut Pro 12.0 title download results in numerous duplicates.

In Terminal, I ran:

cd "~/Library/Group Containers/PTN9T2S29T.com.apple.videoProApps/com.apple.FinalCut/Application Support/Cloud Content.localized/Effects"
find . -iname "*deco*"

and got several hits, including ./BD5B625C-18DA-4631-AEF4-BEBBA2C7ADE2/1/1/Deco - Lower Third.motntitle/Contents/Deco - Lower Third.moti

Not sure if that helps, and it seems like it would be very tedious to clean up, considering how many unhelpfully named folders are in that location. But all those folders had a modified date of January 28ᵗʰ, when I downloaded the new content released with Final Cut Pro 12.

As for /Library/Application Support/Final Cut Pro, all I have in there are my Workspace file and my Command Sets.

These "Closing Title" are stored INSIDE the application bundle itself, they are not downloaded.

Downloaded templates will show you a "Remove Download" option when you right- or control-click on them:

The ones stored inside the application will obviously not; instead, they will act like this (at least if you have Motion installed, like I do):

I could tell you exactly where inside the application bundle these templates are, but since one should never change the contents of the app, I prefer not to dwell on those, lest someone makes their copy of Final Cut Pro cease to work.

Many of them, I'm told, won't open in Motion, which means they're coded, not Motion files, as some of Apple's supplied templates always have been. Coded templates won't be an accessible file.

Correction: I was looking at the wrong Application Support folder. Those files are indeed strange. A handful resemble some of the effects and titles in Final Cut Pro, but the rest just look like leftovers tutorials from an old version.

What’s odd is the PDFs are completely blank when opened in Quick Look and Preview.