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Mac: open Terminal and run
curl -fsSL https://getquire.pages.dev/install.sh | sh
Or download the .dmg below. macOS will say it can't verify the app (it isn't signed by Apple): click Done, then System Settings → Privacy & Security → Open Anyway.
Windows: download the .msi or -setup.exe below. If SmartScreen warns, click More info → Run anyway.
Installed copies update themselves.