The 2020 version introduced several quality-of-life improvements that remain core to the experience today:
Industry-standard for print and digital publishing; seamless integration with Photoshop and Illustrator; advanced automation features. Adobe InDesign CC 2020 Free Download
If you have an active Creative Cloud subscription, you can install previous versions (including some older iterations) through the "Other Versions" menu in the Creative Cloud desktop app. Adobe InDesign Review (CC 2020 Context) seamless integration with Photoshop and Illustrator