IIS Manager in Windows 10
Thanks to @SLaks comment above I was able to turn on IIS and bring the manager back.
Press the Windows Key and type Windows Features, select the first entry Turn Windows Features On or Off.
Make sure the box next to IIS is checked.
If it is not checked, check it. This might take a few minutes, but this will install everything you need to use IIS.
When it is done, IIS should have returned to Control Panel > Administrative Tools
Under the windows feature list, make sure to check the IIS Management Console You also need to check additional check boxes as shown below:
Actually you must make sure that the IIS Management Console feature is explicitly checked. On my win 10 pro I had to do it manually, checking the root only was not enough!