DMG files can be downloaded from the Download page. Click the box labelled macOS and choose Intel or arm64 architecture. Once the download is complete, installation is the same as for any other DMG.
See also the section dedicated to macOS in our FAQ, and the readthedocs page for installation on macOS.
On most Linux systems, you can use the software installer provided with your system (look for “software” in your start menu) to install Inkscape.
Visit the Download page to see a list of other available options and installation methods for each available version.
Probably the easiest way to install on Debian/Ubuntu is to use the apt command.
