Thanks for your answer again !
I upgraded the project before so I think I can’t rollback the upgrade …
So I Loaded another example project (blendingExaple), updated with the projectGenerator before and not upgraded with an SDK or toolset and now I have to deal with theses errors:
“C1083 : Unable to open include file: ‘winsock2.h’: No such file or directory”
"LNK1104: Unable to open file : ‘Ws2_32.lib’ "
As far I search over internet it’s seems to be an path problem of the SDK ?
Which modules did you install with visual studio? The installer gives a lot of freedom but some parts are needed to compile OF. I Had to explicitly check the windows 8.1 SDK and the Windows 10 SDK 10.0.15063.0