Older version??????

See the following for general instructions on installing older versions of Creative Cloud applications.

https://helpx.adobe.com/download-install/using/install-previous-version.html

-Manan

Old/new versions of what exactly?  Please be more specific. And which OS do you have?

Also, please ensure your computer meets or exceeds the minimum system requirements to run latest Creative Cloud + OS + all other apps you use. Check each one.
- https://helpx.adobe.com/creative-cloud/system-requirements.html