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macOS (Apple Silicon): download the .dmg, open it and drag Quire to Applications.
Linux (x86_64, experimental): the .AppImage runs on most systems; the .deb is for Debian and Ubuntu. Report what does not work in an issue.
Windows (x86_64, experimental): run the -setup.exe. It is not signed, so Windows warns first: choose More info, then Run anyway. Report what does not work in an issue.
Installed copies update themselves once this release is published, except on Windows: download the new installer there.