As I recall, the Gridcoin locations are selected when the program is installed. Don't think the gridcoin files can be moved once installed. I am not using the default file location for gridcoinresearch.exe or its data files on my computer. These are my current folder locations:
D:\Program Files\GridcoinResearch <--- Gridcoin Program Location
D:\GridcoinResearch <--- Gridcoin Data Files Location
D:\GridcoinResearch\gridcoinresearch.conf <--- Gridcoin File that points to the location of my BOINC files
( More info on the gridcoinresearch.conf file at:
https://gridcoin.us/wiki/config-file.html )
I believe I was able to "relocate" the data files from Drive C: to Drive D: once by putting a copy of the existing Gridcoin Data Files Folder in the new location I wanted, then reinstalling the program so the program was installed into the new "D:\Program Files\GridcoinResearch" path, and by selecting the existing (copied directory) of "D:\GridcoinResearch" for the data files. On restart, the program started up as normal from the new location and using the files in the new data folder.
I would have made a separate backup of the wallet .dat and .conf files first in case the file relocation didn't work and a completely new install was needed to fix the program reinstall.
At this point I can't remember if I also uninstalled the Gridcoin program to remove it from drive C: before re-installing it to drive D:. But I currently don't have a Gridcoin program folder on my drive C: so either it was never installed there on this particular computer, or it was and I did a remove-and-reinstall cycle to remove it cleanly from drive C:
(I don't use a Mac, so I have no idea if/how it allows for custom install folders.)