"Huh, this is much nicer than anything outside of my dimension I've heard of."

This is not a very high bar - the Scape of Screaming Mouths is nicer than most places he's heard of.

One does one's best.

"I fear I'm a bit out of my depth here, can you tell me about the other dimensions that are connected to here?"

There are simply far too many of them to describe in general terms.

"Could you describe... let's say the dimension the demon is originally from? If that wouldn't be any trouble." Lucien asks for lack of a better option.

Why don't you ask him?

Well, he's a demon.

"I'd assume he isn't very interested in talking to me right now."

Well, I usually don't give out personal information on a patron to another patron without their being amenable.

Lucien glances over at the demon.

Reading something on text made of insubstantial light that's projected out of a weird metallic stick.

Is that ... a miniaturized slide projector?

"Umm, would you be able to tell me if all the dimensions are at similar tech levels to mine?" Lucien asks the bar.

I can't imagine why they would be. There are many at higher and lower and orthogonal tech levels however you construe the phrase 'tech level'.

Well, that settles it. Talking to the demon might be embarrassing after what happened, and possibly also very dangerous, but access to advanced technology is definitely worth it. 

He thanks the bar for its help and excuses himself to go and talk to the demon. 

"Uh, hi."

...Lucien resolves to not make any ab related decisions.

"Hi, I uh, know we got off on the wrong foot but I was wondering if I could trade you something for your world's technology - assuming it's non-magical in nature."

"The technology is nonmagical in nature though if you want a computer like this one it requires brain surgery that's really a lot safer and tidier to have done magically."

"You... had brain surgery to install a person in your head?"

Why is the world always like this.

"The computer is not a person, it's a device. And it's mostly here," he waggles it in the air, "I just control it and encrypt it with a smaller item in my head."

"Huh, does it do anything besides books?"

"It does lots of things. Uh, perhaps you could go on in any more detail about the demon situation in your universe and why you felt throwing things at me was an appropriate response to that situation, so I can calibrate at all before attempting to give you a tech uplift."

"Largely priors - very few magical entities I've encountered have been safe and even fewer have been well intentioned. I've never actually met a demon in my universe and was not confident they existed, but the myths surrounding them feature quite a lot of torture and fire and I'd strongly expect the reality to be at least as bad as the myth."

"Well. I can't actually vouch for the demons in your world if you have any, but it's, like, rude, to attack people who are just sitting there, in most situations. What magical entities have you got out by you?"

"Ghouls, mi-go, drowned, ghosts, young things, and a bunch more? Um. I'm sorry for attacking you but I think if this were my world I could plausibly be dead or worse if I hadn't tried something."

"Well, that sounds really racist to me but maybe it's rational and maybe being racist isn't even unfashionable in your place and time."

"A lot of people are racist in my world but they are wrong about that. People are also probably too anti-magic but it's a much harder call."