Please open the Windows Registry Editor (search for regedit on the Start Menu) and then navigate to the following key:
Check that the "Enable V18 SDK Changes" key is set to "1" (ref. attached screenshot), if not you should change it and then reboot the computer.
If you are unsure of anything, please ask your IT support for assistance.
After the reboot, start NavStation again and check that the Total Tide data is updated.