Statdisk 13 is an older application and is not compatible with modern operating systems such as macOS 10.15 or 10.16. Over the past two years we have transitioned to this new web-based version of Statdisk - https://statdisk.com. This web version will be the only Statdisk application developed going forward. Statdisk Online is being actively developed, has new data sets, and will also work on all of your devices (including tablets and Chromebooks). We encourage you to use the web version.