How to fix the error "Windows SDK version 8.1" was not found?
I installed the 8.1 SDK's version:
https://developer.microsoft.com/en-us/windows/downloads/sdk-archive
It used 1GB (a little more) in the installation.
Update October, 9 (2020). There's a https error: the sdksetup link is https://go.microsoft.com/fwlink/p/?LinkId=323507
"Save link as" should help.
I faced this problem too. Re-ran the Visual Studio 2017 Installer, go to 'Individual Components' and select Windows 8.1 SDK
. Go back to to the project > Right click and Re-target to match the SDK required as shown below:
Another way (worked for 2015) is open "Install/remove programs" (Apps & features), find Visual Studio, select Modify. In opened window, press Modify, check
Languages -> Visual C++ -> Common tools for Visual C++
Windows and web development -> Tools for universal windows apps -> Tools (1.4.1) and Windows 10 SDK ([version])
Windows and web development -> Tools for universal windows apps -> Windows 10 SDK ([version])
and install. Then right click on solution -> Re-target and it will compile
I had win10 SDK and I only had to do retarget and then I stopped getting this error. The idea was that the project needs to upgrade its target Windows SDK.