Step 1. Click on the Creative Cloud icon in the menu bar
Step 2. The Creative Cloud application will open a new window. Find the application you would like to install a previous version of in the list and click on the three dots. Click on the Other Versions menu item
Step 3. When prompted, click on the Install button.
Step 4. When prompted, click on the Continue button to install the application.
Congratulations, you have just installed a previous version of an Adobe application onto your Mac. Please be patient, it may take a while for the application to be installed.