In C:\Program Files (x86)\Coyote\CoyoteWT
there's a bat file to register RegDXi.bat you can right click Run as Administrator.
Or in the bb folder on the hard drive you should have SetupCoyoteWT12.exe right click Run as Administrator.

Or get VSTSynthFont (1.096 / 2.096) - VST instrument
http://www.synthfont.com/Downloads.html

then load an sf2 GM
http://www.synthfont.com/soundfonts.html
http://pphidden.wixsite.com/compifont
https://musescore.org/en/node/94941
https://musescore.org/en/node/103046

Or... there might be a simple fix that someone else will come up with.