Sorry to say El Capitan is no longer a supported OS. Adobe expects customers to have the latest operating systems, no more than 2-3 versions back.
El Capitan, Sierra, High Sierra, Mojave, Catalina, Big Sur, Monterey.
Win 7, Win 8, Win 8.1, Win 10, Win 11.
Please ensure your computer CPU and GPU meet or exceed the minimum system requirements to run Creative Cloud desktop app + OS + all other apps you use. Check each one.
Nancy O'Shea, Product User & Community Expert
Alt-Web Design & Publishing ~ Web : Print : Graphics : Media