Error 209 causes installation failure

Go to System Preferences > System > Users and Groups.

Select the lock icon at the bottom of the screen.

 Type in a current administrator's user name and password in the spaces provided.

Select the Allow user to administer this computer option.

Restart your device and update the app again.

Open Finder.

In the menu bar, select Go > Go to Folder.

Type /tmp and press Enter.

Check if you can access and create files in this folder.

If you encounter a permission issue, open Terminal.

Type ls -ld /tmp and press Return to check permissions.

Once permissions are fixed, return to the installer and select Retry.