There are several tools where you can get informed depending on the implementation step you are currently in?

Outlook of planned innovations for SAP Products

The listed tools help you to get informed about new products / release, which are not yet delivered. 

• Innovation Discovery: https://go.support.sap.com/innovationdiscovery/
• Roadmap: https://www.sap.com/products/roadmaps.html

Compatibility, required software components

Please goto PAM (Product Availability Matrix) and search for you product, e.g. "Engineering Control Center". This will give a list of available product versions.

You can then drill down to details.

You will also find the link to download the software from SWDC (Software Download Center):

Compatibility to other related products

For other details please visit the installation guide on help.sap.com → Search for "engineering control center" → Installation Guide

Here you find version information for 

• SAP GUI
• Windows
• MS Office
• SAP 3D Visual Enterprise Viewer