Install OneCursor on every computer you want to use, then activate it with the license key you received after purchase.
X11 desktops
If Windows shows "Windows protected your PC", click More info and then Run anyway. The installer also allows OneCursor through the Windows Firewall, so your other computers can connect.
Open the downloaded file and drag OneCursor to Applications. The first time, macOS may say it "could not verify" OneCursor — here's how to open it (takes 30 seconds, only once). Then allow Accessibility (and Input Monitoring on your main computer) when OneCursor asks — it shows you exactly where.
Open OneCursor on each computer and answer one question: is this your main computer (the one with the mouse and keyboard you use)? OneCursor finds your other computers on the same network and connects them by itself.
Something not working? See the Help Center.