I have downloaded and installed hundreds of mods, but it always reverts back to the same problem. A New mod always overwrites an old one in the override folder leaving the old mod non functioning. Is there a way to make a self extracting mod instller that instead of overwriting all dat found, will actually do a smart search and "Add" information to the old file if a file by the same name is found? I know that such a thing would not be fool proof and that some issues would still arise if the same file had two mods for one person and such, but I am sure that there would be a way around this. Perhaps searching for information in the 2da file or other file that modifies the same character based on filename? Anyway, this would certainly allow us to fully enjoy our mods and keep all of them active at once.

Does the problem lie with *.2da files?
What kind of Mod are you downloading?
What is the extension and name of the files?

If you answer those questions I may be able to help.

most of the time the conflicting mods are the .2da files which hold basically everything that is important (simply put) Now if you don't have KotOR tool than you can't edit the .2da files to make them retain the same properties, so if you want to edit the .2da files yourself then you need to get KotOR tool. However if you just want a wide assortment of mods than I suggest you just download the Holowan Plugin