Originally Posted by Carbon
Yeah, I normally delete files and folders I assume I don't need after downloading.

I'd strongly recommend you change your years-long behaviour and no longer do this, it will be easier for you in the long run.

These days, MAME is more than just sourcecode and binaries, there's scripts and shaders and things that people think "well this probably didn't change between releases" and choose not to overwrite, causing themselves problems.

We've had to counsel every MAME fork and port maintainer to always bundle the version of shaders matched to that version's release, for instance.