When running Photoshop from a non-Administrator account, Photoshop requires read access to some system-level folders and read/write access to some user-level folders.
Note: A user account with full administrative rights is required for installation.
Read/write access is required to the root folder of any non-boot drive that is specified in Photoshop's Preferences as a scratch disk.
Read/write access is required to any folders into which you've saved files.
Read/write access is required to these user-level folders:
Read access is required to these system-level folders:
Note: The System Library folder is different from the Users' Library folder.
1. Choose Go > Computer
2. Select Macintosh HD > System > Library.