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Don't see anything about pricing for individuals, it would seem they are after companies, educational and OEMs.
The RollBack RX Home, is Free, but seems to have a limit of 7 Snapshots, what happens after that isn't mentioned. There doesn't appear to be a single license payment option for unlimited snapshots for RollBack RX Home.
Whilst it says:
RollBack Rx Home Edition is a FREE instant time machine for your Windows workstation.
It is a comprehensive Windows System Restore solution that empowers users and IT administrators to easily restore their PCs to any previous state within seconds.
RollBack Home Edition helps users better manage and lockdown Windows based PCs.
It doesn't say specifically what windows OSes it supports.
Snapshot #8 wipes out snapshot #1 so you always have a max of 7 snapshots on hand.
For me, this certainly was a time saver for switching back to the free version of Avast. 
Thanks for that clarification.
That's very good, so truly free with a 7 snapshot (backup/rollback) history.
EDIT: I installed RollBack Rx Home Edition on my win10 system today and It takes a snapshot right away.
The interesting bit was I later did a windows update check (still waiting on 19030 and I think that this was it) a notice of a failed cumulative update was there another manual check found a KB awaiting download. Did the KB update and restated when it called for it.
This is when I found a somewhat strange instance during the restart (and before the KB update did its configuration thing, RollBackRX effectively interrupted this by popping up a small window. This was a DOS style window given the time it occurred (pre-boot), which freaked me out a bit.
I used the down key to scroll down to exit and hit return to close the window and thankfully windows update continued with the configuration and appeared to finish successfully.
Have you experienced this (?) and if not you have been pre-warned
