What happenned to my restore points in Windows 10?

They disappeared because there was an automatic update of the operating system.

One creates system restore points to go back in case there is a problem. Typically when you encounter some rpoblem you would want to go back to a restore point you have created. The restore point would still be available to you were it not for the automatic Windows Updates.

It would be nice if there is a way of having OS on one drive that does not update (so restore points are available) and OS on the other that can update and install the better(?) code.

What is the latest Windows 10 release version?

If you work with Windows 10 you better know what version you are using. Additionally, if you are in the Windows Insider program you better know the build you are using.

Windows OS updates are automatic. The Insider builds may interfere with your other programs. I noticed it accidentally and could not make something work which worked like a clock earlier.

https://hodentekmsss.blogspot.com/2017/11/report-builder-3-has-ui-problems-that.html

The Windows 10 release information my be found here:
https://technet.microsoft.com/en-us/windows/release-info.aspx

Here it is all tabulated:

Windows 10 Versions.png