hello, try to do what friend chomp said, but instead of installing manual STP do this SPT-AKI-INSTALLER
It's very simple to install, after downloading and extracting, create a folder if possible on the same disk as the online installation and place the exe. that you extracted in it, run it as admin., let it work and when it finishes run serve.exe once so that it creates the folders that you will use to place the mods. close serve.exe after it gives the message that everything is ok.
put the mods of your choice, be happy,