Hello,
I'm running Sibelius 2019.7, VDL 2.5.5, Kontakt 6.1.1, and I'm on a MacBook Pro with Mojave.
I initially bought TWS while running Sibelius 7.1 and had no luck getting it to work. I did the correct installation pathways but couldn't get the sound set to show up in the drop down menu in playback configuration while activating Kontakt. In fact, after I did all that Sibelius stopped playing back altogether, and wouldn't even do the Sibelius sounds when I tried to work in one of the default playback configurations. Some posts in the forum made it seem like I needed a newer version of Sibelius, so I upgraded to Ultimate thinking the default playback issue would resolve itself when starting fresh in Ultimate. However, before I ever tried again with copying the provided .xml file into the sounds folder, Sibelius still wouldn't play back on its own.
I created a Sounds folder, copied the .xml file into it, and was able to make my own playback configuration with Kontakt properly activated with the VDL sound set. However, when I load any trigger test or go through the template and select instruments, nothing gets loaded into Kontakt and no sounds play back. And still, Sibelius sounds don't play no matter what playback configuration I'm in. I didn't alter any Sibelius sounds that I know of, the only thing I did inside the Library folders was create a Sounds folder and copy the .xml file into it.
Also, I'm not sure if this is important, but I moved the Kontakt folder and application inside my Virtual Drumline folder when I first downloaded Kontakt, but the full library is loaded into Kontakt. I'm not sure if the location is giving Sibelius any trouble.