This is my implementation of a php script developed by @beely that will return information about the plugins used by Logic Pro projects selected in the Finder.
Use case examples:
1:
Problem: Geist 1 is no longer supported and I know that one day I'll upgrade MacOS to find that all the projects that use it are suddenly unplayable.
Solution: I select my Sessions folder, trigger this macro, and search for "Geist". After a short while, I am presented with a list of all projects that use that plugin, and am able to open each one and freeze/bounce each instance.
2:
Problem: I want to open a project that contains plugins not installed on my system. What's the easiest way to determine what they are?
Solution: I run this macro and use the Uninstalled function which returns a list of all plugins I'll need to install before opening the session.
Plugin Report.kmmacros (86.9 KB)
Setup:
Change the path in the green action to point to your copy of the lrep php script. Download it here.
In Use:
Select a Logic Project or a folder that contains multiple Logic Projects and run this macro. (Subfolders are supported.)
This will pop up:
If you're running this on a single project file or a folder with a few inside, it should run very quickly. If you're running it on your entire projects folder with hundreds or thousands of files in, plan on a coffee break. 
By default, search results will be trimmed to include only information about the latest project Alternative. If a single project is selected, you can choose "All" from the dropdown to include all previous Alternatives too. (This option will not appear if a folder of projects is selected.)
Show Uninstalled and Show All will run their respective commands, and Search will open a second prompt before searching the Finder's selection for that particular plugin:
Finally, a clean and readable report is displayed at the centre of the screen.
