the installer seems to install both 32 and 64 bit - on my win10 system the 32 bit are installed in:
C:\Program Files (x86)\Common Files\KORG\Plug-Ins\VST
dunno why ? these are the ones you need to jbridge to 64 bit
What I did was create a korg subfolder in one of my normal plugin directories and COPIED all the korg plugins ( and that .dll.settings file) to this directory - I think legacycell might want the other plugs in the same directory which is why I copied the lot. Then I ran the jbridger thing on that folder to create a 64bit file ONLY on the Legacycell.dll.
This creates an LegacyCell.64.dll in that directory.
let me know if that works.......