You can install older versions of Adobe software using the Creative Cloud desktop application. For some reason this feature is not easy to find in the Creative Cloud app, so I’ll lead you through the steps.
- Click the icon for the Creative Cloud desktop application to open it. On the Mac, that icon is in the menu bar; in Windows it’s a tile on the Start screen or an icon in the Taskbar.
- In the Creative Cloud application window, click Apps near the top.
- Scroll down and click the gray Find Additional Apps section. (Do not click the confusingly named Previous Versions heading on the left, because that section lists only the previous versions you’ve already installed).
- Click the blue filter menu the right (which defaults to All Apps), and then click the blue View Previous Versions link at the bottom of that menu. This changes the list to Previous Version, and adds a drop-down arrow to the Install buttons there.
- Find the application you want in the Find Additional Apps section, click its Install button to see the menu of previous versions, and choose the version you want. The Creative Cloud app will install that version.
If you want to install a version between the ones available, you may need to install the next earlier version and then run any minor updates that are offered until you get back to the version you want.
Rolling back with standalone installers
If you can’t find the version you want in the Creative Cloud desktop application, or you need to reinstall without the Creative Cloud app, you can download standalone installers for many Adobe products. This may be an easier and more direct way to get back to versions not available in the Creative Cloud desktop application. Here is an Adobe page with links to installers for many versions of Lightroom: Download Photoshop Lightroom
On that page are links to other standalone installers for Adobe Creative Suite applications from CS3 to CS6 (including Photoshop, InDesign, and Illustrator), Acrobat, Photoshop Elements, and Premiere Elements.
ProDesignTools also maintains pages with direct download links to standalone installers for many versions of Adobe software. Here is their page for Creative Cloud 2015 applications; there are also links on that page to other versions and Lightroom: Creative Cloud 2015 Downloads: Adobe CC 2015 Direct Links / Trials
Software installed with those official installers will typically start up as a time-limited trial version by default. Make sure you have your valid product key/serial number or an Adobe ID for a paid Creative Cloud membership; you’ll need it to convert the software from a trial version to a fully licensed version.
[Note: This article was updated in June 2016 because the menus for finding older versions have changed.]