Some problems while following along the Twin Stick Shooter Tutorial

The Tutorial in question is this:- Blueprint Twin Stick Shooter | v4.8 | Unreal Engine - YouTube

Also, there is a doc file given in the first video that i will talk about later, link:-

And finally, the part where the problem is occurring:-

See in that video he asks you to create a character class.

Once you do that and you close the project, trying to open the project will lead to the following problem:- “ERROR: Windows SDK 8.1 must be installed in order to build this”

So anyways, installing windows sdk did jack **** for me, so i didn’t know what to do.

After that i assumed that maybe i have to do the coding part after which my project will open up correctly, so i completed the coding part. And after that the errors mentioned don’t occur at all. BUT BUT the Ctrl+Shift+B did not do anything for me, and i tried manually clicking the “Build” option, and nothing happened there as well. I suspect this might have to do something with the errors.

But anways i just saved the coded files, and now this new problem occurs when i try to open the project:- " The following modules are missing or built with a different engine version: UE4Editor-Filename.dll, Would you like to rebuild them now?" Under them are “Yes” and “No” options.

Clicking “Yes” shows the following message:- “Filename could not be compiled.Try rebuilding from source manually”

Also, i should mention that the narrator’s version is 4.8 while mine is 4.14.
Also, my Visual Studio version is Community 2015. Some help please??

EDIT:- I also don’t know anything about programming.