1. Download and start x4u

Unzip it, start it, and your library opens in the browser.

1. Unzip it wherever you likeNothing is installed. Your library is kept separately, so the folder can be replaced when you update.
2. Start itOn Windows, double-click x4u.exe. If Windows says it protected your PC, choose More info, then Run anyway. On macOS and Linux, run ./x4u.
3. Your library opens in the browserx4u is a program on your computer with its page in your browser. On Windows and Linux its icon sits by the clock: right-click it to open x4u again or quit it.

If Windows Firewall asks whether x4u may use the network, allow it on private networks. That's what lets your phone and headset reach it later.