I have the same problem and I also have not gotten any response from Support. In other words, I run the soundset installer and afterwards the destination directory has just a few uninstall files. The VSL house style file was not installed and is not visible in Sibelius 8. Also within Sibelius, the soundset files for Special Edition, Choir, etc. are not present.
Thx for any help.
I'm also having issues with the Sibelius Soundset Installer on Windows 10 with Sibelius 2018.1. I've installed the latest (and only) soundset download available in the MyVSL section. It added the "VSL Ensemble Special Edition PLUS.xml" and "VSL Ensemble Special Edition.xml" files in my ProgramData/Avid/Sibelius/Sounds directory.
What was missing appeared to be any way to get the Choir sounds to play correctly and the VSL house style is also missing.
To solve the Choir problem I found an old version of the VE Choir.xml soundset and copied it into the ProgramData/Avid/Sibelius/Sounds directory. That seemed to work, though I suppose there is a more recent version available?
The outstanding issue is that I have no access to the VSL house style. It does not appear in the Import House Style list. Any help would be appreciated on cleaning up/fixing this installation
Thanks!
Dave