Installation Problem

Owing to Adobe's new version policy, pre-2019 versions of Creative Cloud apps are difficult if not impossible to obtain.

The best you can do is open your Creative Cloud desktop app.  Click on gear icon (top toolbar). Select Show Older Apps. See screenshot.

Scroll to the specific app and click More actions (3 dots icon).  Select Other Versions from the context menu.

Post back if you need more help.

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That is not possible. First IIRC there was never a Creative Cloud App, the Creative Cloud Desktop Application, that actually had a year designation, 2016, 17, 18 or whatever.

Secondly if you had upgraded the CC DTA there is no going back. None of the earlier versions of the CC DTA were ever made available for download.

Thirdly if you are asking about a Specific Adobe Application, Program, like Photoshop or InDesign or whatever other Adobe Program, please state the name of that program.

Some are available but only 1 or 2 version back from the current release and the only way to get them is through the CC DTA.