Adobe stopped supporting CS6 in 2014, and official downloads are no longer available even for Creative Cloud subscribers. Adobe Encore CS6 Product Review

For users who still have access to a legitimate installation, the software remains a powerful, if aging, tool. Open Adobe CS6 Encore | Community

You may need to run the application in "Compatibility Mode" for Windows 7.

System Resources: It doesn't require a heavy installation process that alters system registries.