HALion 6 presets not listed in mediabay

Cubase 8.5.10 and HALion 6 v.2.5.10 build 35 installed on two computers:

  • First computer with Windows 7 PRO 64.
  • Second computer with Windows 10 PRO 64 ( build 1803 ).
    Halion 6 presets saved in the first Cubase ( windows 7 ) and copied in the second Cubase are normally listed in Media Bay of the second Cubase ( Windows 10 ).
    The same presets listed in the MediaBay of the second Cubase (Windows 10 ) and re-saved in the second Cubase (HALion), copied in the presets folder of first Cubase ( Windows 7 ) are no more listed.
    Why ?
    Thank you.