A compatibility issue has been discovered with the latest release of Windows 10 (1903), which requires the user to run the BC Vault application as an administrator, as the system can otherwise not access the BC Vault hardware device.
We are working on a solution, but for now, please run the BC Vault application as an administrator.
More information on the issue:
https://support.bc-vault.com/support/solutions/articles/43000519526-bc-vault-is-not-recognised-under-ms-windows-10