Don't know how to install iDraw extension files for Inkscape? Check this guide step by step.
1.Download the software in this ZIP file, and unzip it. (Your computer may unzip the archive automatically for you.)
2. Open Inkscape
3.1. For Windows system: From the menu, select Edit > Preferences .
3.2. For Mac system: From the menu, select Inkscape > Preferences.
4.Select System from the list on the left panel of the preferences window.
5.On the right-hand panel is a list of directory locations. Click the "Open" button to the right of the "User extensions" folder location.
6.Copy the contents of the ZIP archive that you downloaded into your Inkscape extensions directory, overwriting any files and directories with the same names.
7.Launch Inkscape, or quit and re-launch it if it is open.