Hi and welcome :-)
Don't know where your problem with the extensions manager itself is, but you're basically thinking right, it's not really needed for installing macros (extensions), only meant to make things easier:
Basically all it usually takes is to throw unzipped extension files into their matching folders, and that structure is usually mirrored in the zip structure. The one thing you're mistaken: Overriding only happens if a *file* already exists, but that doesnt mean that in a folder other files with different filenames would vanish. So unless a single file has an already existing name, there's nothing to overwrite, and those new files are just added to the others in that folder.
Most macros consist simply of a single kmm-file, which must be put in the "macros" folder, that's all. But there are also more complicated ones sometimes, which require more actions, that's where the extensions manager really makes things easier.
By the way, its always a good idea to keep a backup copy of the KM-profile folder, and better yet also the KM program folder, and then you can freely experiment with everything
Edited 3 time(s). Last edit at 08/12/2010 10:04PM by siria.