According to the NVDA user guide section 15.11 We need to download the drivers from:
When accessing that site and clicking on the Seika-Braille Display Driver for NVDA, Seika Version 3, 4, 5 and Seika80 (BrailleDisplayDrivers) you are asked for a user name and password. Unfortunately, we cannot download the drivers to get this braille display to work.
Can you please look in to it?
Mr. Deenadayalan Moodley