I can't Package my project

I Try to package my project but fails, comes up with Unknown package error can you please help me ?

Install Windows SDK v8.1, try to compile again and report back! <3

Im currently doing than, instaling SDK and will see what happens next ty for respond, when install finish i will report back <3

First of all thank you so much for fast respond and correct answer ! <3
But i counter with more errors after SDK !

  1. : Im windows 10 user, and i download SDK 10, and i get same error.
  2. : i download SDK v8.1 and that error was fixed, but i counter new one !
  3. : i have to download C++ from custom modification in Visual Studio cuz they didn’t comes with VS unless you selectem from custom download. or download them after.
  4. : that error was fixed i counter new one (Error Package : Filename is too long !) and all i did is download third party program Long Path Tool and gives me all names with more than 190 characters and i rename it in Unreal Engine Ex. Wood_Texture_Displace_1280_768 to WoodDs…
  5. : and finish with package no errors no warnings Thanks !