First of all, Thank you for the help.
I used the command "pip install krpc" on the comand line (cmd) as you said, but now the error is that "pip" is not recognized as a command, program, or file.
After some searching, I finally made it work by instead of using "pip" using the whole adress to the file, then using the "install krpc"
I´ll leave this here in case someone has the same problem.
Thank you!
(Sorry for my english, its not my first language)