visual studio does not recognize windows 10 sdk in version 10.0.14393.0

Reinstalling Windows is not necessary. Modify the existing installation of VS2017 and remove the check next to Universal Windows Platform development, then go to the Individual components tab and select the Windows SDK 10.0.14393.

Click Modify.

Once finished, Modify the existing installation of VS2017 again and recheck the Universal Windows Platform development box and Click Modify.

Problem resolved and no restart required.

I had this same issue but resolved it by installing the .033 version rather than the latest .795. It is available on the SDK download page in the description of the SDK by clicking on the link behind 'QFE':

Windows 10 SDK (ver. 10.0.14393.795 – a QFE for 10.01.14393.033) and Microsoft Emulator for Windows 10 mobile

Also, even though it wasn't required, I uninstalled .795, then rebooted. Then installed .033 and then rebooted again prior to trying to open visual studio.

I'v already installed Windows SDK 10.0.14393.795 successfully. Then I create UWP project which targets 14393 successfully. So I could not reproduce your issue.

I already tried reinstalling of visual studio and several SKDs in different versions from VS or the online link and nothing worked.

If you have tried to repair your visual studio, but it still didn't work. You'd better use  http://aka.ms/vscollect to gather the installation logs. Find vslogs.zip from %temp% folder. Please upload the file and share the link here. I will help you find the root cause according to the log file.