There is also a Homebrew formula available for Inkscape 0.92.1.

This formula has been posted to the Inkscape user mailing list by its author, Tim Sheridan. As per his instructions, when you have Homebrew installed, you can install Inkscape with

brew install caskformula/caskformula/inkscape

Note: If you've previously installed Inkscape using Homebrew, you should run the following commands to remove previous installations before using the installation command above: 

brew uninstall inkscape
brew cleanup

The Homebrew formula is provided by Tim Sheridan. If you encounter issues with installing Inkscape this way, please create a bug report in its repository at github.

Support Inkscape

Inkscape needs your help. Every user who can contribute to Inkscape's development is investing in the future of the project. Donations allow us to do so much within the project to continue providing you with new releases of Inkscape with better features and bug fixes.