I've tried to update from 10.5.4.0 to 10.5.5.0 and I've got this error:
Component version mismatch!
Program 10.5.5.0.
Library: 10.5.4.0
Language 10.5.5.0
Please reinstall Directory OPus.
I've reinstalled it but it didn't help. Also found topic with same problem, but for DO9. It didn't help. I have Windows 8.1 PRO 64 bit.