My understanding is that updating the data to the latest version will upgrade all previous versions to the current data and all will function the same. So all an owner of the older versions need is the data upgrade to be current. 3.9 was released as a work around to assist a simpler install with Windows 10.
You can send them an email with your questions and they will respond promptly. You might ask when the next data upgrade is due for release because there are some new powders out that are not in the current data.
These details are published on their website, so might as well get the facts straight from them.
