Can't install 3rd party extension - 501 error
I'm trying to install a 3rd party extension, MagicPicker6.zxp, for Photoshop CC 2017 on my Mac OS 10.12.5. I followed this command line instructions: Install add-ons and extensions for Adobe apps
Adobe's error code page said my -501 error means "Installation failed, could not update database. Solution: Contact the Adobe Exchange Online Forum for assistance.
How can I install this extension?
