Installing an interface
Installing an interface is really easy. Unzip the file and copy it as a whole to
C:\Program Files (x86)\MTA San Andreas 1.4\skins
Skins don't show up? Still got a MTA San Andreas 1.3 file? Try saving it to:
C:\Program Files (x86)\MTA San Andreas 1.3\skins
Start up MTA and there it is! Though, you might have installed MTA somewhere else. Locate it and go to the skins file and you're done.