What is vRanger 6.1 future build?

Not sure if this is the correct forum to ask.

I know there is a vRanger forum in Dell TechCenter, but somehow my account has no right to post message there.

So, we are using VMware vSphere 5.5, and just bought vRanger Pro 6.1 to backup the VM.

Then we found this incompatibility

https://support.software.dell.com/kb/SOL115277

And it says "Full support for vSphere 5.5 has been included in a future build of vRanger."

What is meant by a future build of vRanger 6.1?

Is it 6.2?

Or 7?

Most importantly, are we allowed to upgrade to that "future build" for free?