Hi,
Yes this widget will not support in Mendix 9 version. But you are trying to download this in 9.4.0 version.
You can try to go through the trouble of first downloading it into a Mx7.high version. Then in a Mx8 high version from the Mx7-app’s project directory/widgets. Then into Mx9 from the Mx8-app’s project directory/widgets.
If you succeed please help all of us and upload it to marketplace.