Hello, I hope someone can still help me with this…I don’t know where you find those “Unit” or “Sound” Folders…When I open the “Installer Tome.mpq” in MQP Editor I don’t see those 
@Arabo28
Not sure what exactly you mean, but did you try extracting the PL sound files from the 1.27b version you can find here?: Classic Warcraft III --- Official Installers - Official Patches (you gotta install the 1.27b game & extract it then iirc).
@Naishe
It sounds like you didn’t extract it from the installed pre-Reforged version (e.g. 1.27b: Classic Warcraft III --- Official Installers - Official Patches). You probably opened the .mpq file from the installer instead of the installed 1.27b game? You need to install that version first, if I’m not mistaken & then extract from the .mpq files I mentioned in my tutorial.