This was recently brought up in https://forum.vcash.info/d/60-change-the-data-directory.
Make sure that the daemon is not running and launch
cmd as Administrator. Then correct the
*user* and change the source path
"C:/New Vcash data folder" to the path you want to use and run the command.
mklink /J "C:/Users/*user*/AppData/Roaming/Vcash" "C:/New Vcash data folder"