Version 6 supports SharePoint 2016.
We accidentally removed support for it for a short while when releasing version 6, but we have now restored support for it. We apologize for the confusion and any inconveniences this caused.
You can go ahead and use version 6 for SharePoint 2010, it is fully supported. The install package includes two files, one for SharePoint 2010 and the other for SharePoint 2013 and later. Please use the appropriate installation file. They are both included in the installation package you download from our website.