had a bad day probably. DL means download if we're talking about apps or files. Oh and btw, DLSite is freaking bonkers. An all purpose download store, from innocent to explicit (well mostly explicit).
You asked a retarded question. What the fuck did you think DL stood for? Down low? Disabled list (you're on it)? Deciliter? No seriously, how absolutely retarded is that question? The entire point of DLsite is to download shit that people made. So obviously it would be DOWNLOAD. Especially given the context that it is a website that hosts downloadable files. Me being a dick doesn't change the fact that you are a dumbass, and pointing out that I am a dick doesn't give you IQ.