Hot Reloading Fail for creating an actor class

I just opened UE some time ago, and i tried to create a class (an actor one) really simple, but then i proceed to get a compile error.
i copied some of the red parts the output log gave me, since i speak another language and you wouln’t be able to understand.

ERROR: Windows SDK v8.1 must be installed in order to build this target.

I kind of understand this, but i have no idea what is Windows SDK.

Performing full C++ include scan (hot reloading a new target)
Compiling game modules for hot reload
ERROR: One or more of the modules specified using the '-module' argument could not be found.

I tried solving it alone, and found out it could be related to modifying the engine, BUT I JUST WANT TO CREATE A ACTOR CLASS! Why is this popping?
Also the part where it says:

ERROR: One or more of the modules specified using the '-module' argument could not be found.

repeats over and over in certain places.

there are other minor erros but there is way too much to list here.
Here is the compile output log:


EDIT: i downloaded Windows SDK and i
noticed i created the Project in
blueprint mode. I’m such a dumb guy
sometimes.


UPDATE: i found out what Windows SDK is. but i don’t know the latest version or my version.