We reimagined the paint engine, so SketchBook delivers more fluid pencils and natural painting than ever before, all while keeping the interface clean and simple. We are investigating this issue and hope to have a fix in the next update.Autodesk® SketchBook® is an intuitive painting and drawing application designed for people of all skill levels, who love to draw. This is not a valid image file, its format or its size is not supported, or you may not have read permission for it.", yet the brushes still import correctly. Some users on Mac have reported seeing an error "Couldn't open the file. NOTE: The zipped files can be imported into the d esktop version of Sketchbook Pro without extracting. The zipped file will download correctly and you will have. To correct this issue, use a different browser, such as Google Chrome. zip format can be an issue when using the Microsoft Edge and Internet Explorer browser to download. Locate the downloaded brushes (usually in your Downloads folder).Tap the upper right corner of a brush set to access its marking menu.Extras will not install on the current iOS and Android versions of Sketchbook, but this option is coming soon!.Brushes can also be installed in earlier versions of Autodesk SketchBook for desktop You can install extras on on Sketchbook Pro for desktop (Mac and Windows version 8.x or higher).There are some key points you should keep in mind: We are introducing new categories of free extras starting with the release of Sketchbook Pro 9.0 on Windows, and coming next to Mac, iOS, and Android. You can download free Sketchbook brushes and more from our Extras library!