addon won't load

[Bonniemancer]

I have been trying to install the add on so I can use the mount wheel. It installs okay but then comes up with the box below. I don't think I am installing it wrong, because I put it on my other older computer and it worked just fine, but it doesn't want to run on this one. My video drivers are up to date and I am running directx 12. Your page gave a link for directx 9, which I tried, but it told me that it can't install it as I have 12 installed and 12 should run 9. It's my understanding that they are backwards compatible. Once I uninstall the addon, GW2 will run again but I really want the wheel as I am running out of keys. Any help will be appreciated.

Thanks