QtiPlot
You can find the installation guide in the PDF compendium which you can download together with the software from AcadCloud.
Do not download updates from the manufacturer's websites, these are just demo versions.
Notes
- The software is not free. You have to order it in AcadCloud.
- If you have obtained the software as a download in the form of a ZIP archive, unpack the files onto your hard drive before installation. To do this, copy the contents of the ZIP file to a folder on your hard drive or right-click on the ZIP file and then select Extract All.