2. Change the permission on these folders and all items within these folders to Read & Write. To perform the permission changes, refer to the topics Assign permissions to users and groups and Apply permissions to all items in a folder or a disk in the Apple article Set permissions for items on your Mac.
Note: Make sure that you apply Read & Write permission to all enclosed items within these folders. It requires your administrator name and password.
3. Launch Lightroom.
Use a script to restore permissions
If the previous solution does not resolve the folder permission issue, try this easy-to-run, shell-script-based solution explained below. This shell-script automatically restores the ownership and read/write permission, and it removes Access Control List (ACL) from the set of Adobe user folders and its subfolders.
Download LightroomCorrectPermission.zip using the above link. By default, the file is downloaded to /Users/[user name]/Downloads/LightroomCorrectPermission.zip.
Unzip the downloaded zip file to extract the LightroomCorrectPermission.sh shell script file.
On your Mac desktop, type Terminal in the Spotlight search box and launch the Terminal app.
From the Finder, drag the unzipped LightroomCorrectPermission.sh shell-script file (from step 2) onto the Terminal window. You see the following text in the terminal window: /Users/[username]/Downloads/LightroomCorrectPermission.sh
Press Enter to run the shell script.
When prompted, enter your Mac login credentials. Note: Ensure that you use the account with administrator privilege to log in.
Set up a new admin user account
Create an admin user account to identify permissions problems. For instructions on creating an admin user account, see the following: