The desktop app is coming.
It isn't ready yet. Until it is, download.fyi works in any current browser on Mac, Windows and Linux, with nothing to install.
Use the browser for now
The web app already does everything the desktop app will: send files of any size, send to devices on the same network with Nearby, and keep a file for 14 or 30 days. While a live link is in use, keep its tab open.
Have the old desktop app?
The earlier desktop app, version 1, doesn't work with the new download.fyi. Please use the browser until the new app is out.
Questions
Write to contact@download.fyi.