Install Windows — pick one: markdown-studio-windows-x64.msi (Windows Installer, per-user — no admin prompt: installs to %LocalAppData%\Programs, Start Menu, Add/Remove Programs, in-place upgrades; silent-deployable with msiexec /i … /qn), or markdown-studio-windows-x64-setup.exe (same result via Inno Setup, plus an optional desktop icon), or the portable markdown-studio-windows-x64-portable.zip (extract and run markdown_studio.exe). SmartScreen may warn on unsigned builds: More info → Run anyway. Upgrading from a pre-1.0.9 build (which installed to Program Files)? Uninstall that one once first — it's a different install location. Linux — easiest (Debian/Ubuntu): sudo apt install ./markdown-studio-linux-amd64.deb — desktop entry, markdown-studio on PATH, and .md file association included. Portable alternative for any distro: mkdir -p ~/.local/opt/markdown-studio tar -xzf markdown-studio-linux-x64-portable.tar.gz -C ~/.local/opt/markdown-studio ~/.local/opt/markdown-studio/markdown_studio Requires GTK 3. Built on Ubuntu 22.04, so it runs on any distro with glibc 2.35+ (2022 or newer). Android — download the .apk on the device and open it (allow "install unknown apps" for your browser/file manager when prompted). The .aab is the Play-Store upload artifact, not for direct install. Android files appear only on signed releases (the repo's keystore secrets configured); unsigned Android builds are never published because their per-build certificate would break in-place updates between releases. macOS — download markdown-studio-macos.zip, unzip, drag the app to Applications. The build is unsigned: on first launch right-click → Open, or clear quarantine with xattr -dr com.apple.quarantine "/Applications/markdown_studio.app". iOS — markdown-studio-ios-unsigned.ipa is unsigned (no App Store yet): install it with a sideloading tool that re-signs with your Apple ID (AltStore, Sideloadly) or via Xcode with your own provisioning.