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Fixed: the compact text size now reaches labels, buttons, menus and lists too (the desktop theme was keeping them at the system's larger size), so the whole interface really is smaller.
Install
Debian / Ubuntu: sudo apt install ./gantry_*_amd64.deb. Gantry appears in your
app menu, and .gan files can be opened with it.
Windows: download Gantry-…-windows-x64-setup.exe and run it. It installs for your
user (no admin needed) and can open .gan files. It isn't code-signed, so SmartScreen
may warn you: choose More info → Run anyway.