Hello.
The answer is: Normally no, you should not include it. In fact, doing so may cause problems, because if a wrong version is incldued, QuickOPC may fail.

There are situations under which including the certificate generator EXE may be needed - this usually is when there is a problem with the "boxing" library, and the librarye needs to be turned off - as described on kb.opclabs.com/How_to_disable_prerequisites_boxing . But this is not your/the customer case (at least we have not determined that).

I will reply to your other post with the certificate generator-related error later, separately.

Best regards