4b2b Desktop
Download for Windows · Download for macOS
Download for Windows
Installer — updates itself. If Windows warns you on first launch, choose to run it anyway.
Portable ZIP — Portable ZIP — unpack it and run 4b2b.exe, nothing gets installed
Download for macOS
For Apple Silicon Macs (M1 and newer). On first launch macOS asks for confirmation: System Settings → Privacy & Security → Open Anyway.
Intel Mac — For Macs with an Intel processor