https://bugs.winehq.org/show_bug.cgi?id=50643
--- Comment #6 from GearoidB gearoidburke@outlook.com --- I don't know if this is the appropriate medium through which I should communicate this, but a viable workaround for this specific application is to install the IK Product Manager on a Windows machine, whether real or virtual, tell the program to download the product you want, then move the downloaded zip file from /Documents/IK Multimedia/IK Product Manager/<downloaded plugin> to your Linux machine, extract, then run the contained exe file. The plugin will install, albeit extremely slowly, and you should be able to use the VST with an appropriate bridge. Hope this helps!