I am seeking guidance on where to purchase the CNH EST engineering level software, as I understand it is essential for working with case electronic service tool equipment. Additionally, I would like to know the latest version available, as I am confused by the various version numbers such as 8.6, 9.6, 9.1, 9.10, and 9.11. Could someone please clarify the differences among these versions? I currently have a DPA5 adapter, and any information on compatibility would also be appreciated.