If you are connected to the internet, InDesign will send the file to Adobe’s cloud servers.
Go to > Save As and save the document as a standard InDesign document ( .indd ). This converts it natively into your older software version. Alternative Method: Creative Cloud Seamless Down-Saving how to convert indesign file to older version
is a powerful standalone application (for macOS) that allows you to preview, convert, and open InDesign files without even having the app installed. The Windows version is called IDMarkz SE . If you are connected to the internet, InDesign