Now it's getting more interesting

First off, I'm running the current Ghostscript, as per your instructions and "gs - v". Calibre got updated today to 7.2.4. From what I can tell, all PDF-related extensions are enabled, but there's a lot of random stuff in there. Not finding pdfmanipulate is totally weird, right? Funny thing is, it's claiming this locate.database issue but I've built that database a few times now.
Thoughts?
ERROR:
home: noah$ ./pdfstretch.sh 3x7=21.pdf
Looking for ebook-meta ...
WARNING: The locate database (/var/db/locate.database) does not exist.
To create the database, run the following command:
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
Please be aware that the database can take some time to generate; once
the database has been created, this message will no longer appear.
Could not find ebook-meta calibre subprogram. Skipping metadata steps.
Looking for pdfmanipulate...
WARNING: The locate database (/var/db/locate.database) does not exist.
To create the database, run the following command:
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
Please be aware that the database can take some time to generate; once
the database has been created, this message will no longer appear.
Error, Could not find calibre's pdfmanipulate subprogram.
The script cannot work without it.