Solution:
1. Copy file wodcertificate.dll to the installation directory (STAT_HOME 6.0) of the program that is requesting wodcertificate.dll.
2. If that doesn't work, you will have to copy wodcertificate.dll to your system directory (C:\Windows\System32)
3. Open the command line (cmd) and register it:
regsvr32 wodcertificate.dll and press Enter.
4. Reboot and start Stat 6.0 client