102
Decimen Lets You Send Files Through Light, Not a Network
(linuxiac.com)
This is a most excellent place for technology news and articles.
You did not. It's a web application, it even says so in the snippet you used for the post. It runs directly in the browser, no need to install anything.
So you need to be connected in order to grab the application. Or you need a local cache (similar to installing the software).
That's my bad for writing it poorly. I meant to say that about the premise of not needing internet, since someone who has internet on both devices might have better ways to transfer the files.
Someone would need to plan ahead and install the PWA (or some compatible tool) in order for this to work