How do you know the IIS version in Windows 10?
If you have Internet Information Services installed, go to the Control Panel and open the Administrative Tools menu, scroll down the list until you see Internet Information Services (IIS) Manager and double-click it. Select Help from the IIS Manager menu bar, then select About Internet Information Services and a window will appear with the IIS version number as well as other information.
If you do not have IIS installed you can easily install it by going into the Control Panel, double-click Programs then choose Turn Windows Features On or Off. In the Windows Features menu check the box next to Internet Information Services then select OK. The IIS installation will begin. Once completed, follow the instructions in the first paragraph to see the version.