As so frequently happens in the era of Windows As A Service, we're in another period where a huge number of Windows 10 users are on one version (1803) while another huge number is on another (1809). Regardless of the specifics of the version transitions, there can also be issues related to what dot number you're on within a given version and build.
You can get your Version and Build numbers by:
- Hitting the Windows Key.
- Immediately typing winver.
- Hitting Enter.
You should then be presented with a dialog very similar to this one:
It's the information on the second line, starting with the word "Version," that's really necessary to ensure the advice you receive will be as accurate as possible.