We're looking into the problem, but we are actually no longer supporting XP now that Microsoft is not supporting that OS any longer. My understanding is that XP users can upgrade for free to Windows 10, so contacting Microsoft to inquire about this would be a good idea.

Alternatively, XP users can search for the bcrypt.dll file online and download it to the Windows System 32 folder, but as I cannot guarantee the integrity of any such file found on the web, so En Masse cannot endorse this as a resolution to try.