Thanks to everyone here, and especially judemiller, I finally got my Flux working. The first part of the problem though is that Flux is not even in the full 11GB installer. I just looked in the Cubase for Windows\Additional Content\VST Sound\PresetVSTSound of the full installer and there is nothing inside. I then downloaded just the 1.43GB update and in that folder was the FCP_SMT_232_HSSE_Flux_Presets.vstsound .
So, as suggested by judemiller I then copied FCP_SMT_232_HSSE_Flux_Presets.vstsound to Halion Sonic SE libraries directory, double-clicked to registered it with the Halion Library Manager, restarted Cubase, and now it works.
So for those of you who are not even finding the files, download the update version and try again because that’s where it is. Not in the full version. I guess Steinberg will address this in time. Cheers.