Windows

Windows 10 or 11, 64-bit

Download for Windows

Setup program (.exe)

Windows may show a SmartScreen warning when you run this: here's why.

Run the setup: it installs per-user, so no administrator rights are needed. It shows its progress as it works and offers to close a running copy when you upgrade.

Linux

Any distribution with Flatpak

Download for Linux

Flatpak bundle (.flatpak)

Install with flatpak install o7debrief.flatpak. On Ubuntu it has watched a real session with the game under Proton and opened the finished debrief in a browser on the host. To have it start at sign-in, switch that on in Settings after installing, which a Flatpak cannot do for you.