Plesk 9.2.1 Greylisting

In case, like me, you’re having trouble enabling the newly supported ‘Greylisting’ feature after upgrading Plesk to 9.2.1, I managed to find the solution.
Every time I tried to enable Greylisting I got
Failed to exec glmng cli. file does not exist or is not executable: / usr / local / psa / admin / bin / glmng
It seems that the Updater from the Control Panel fails to complete all the tasks necessary. Thankfully I found a blog post on which explained how to complete upgrading manually.
and then proceed through the remaining screens using ‘Enter’ for the default Next Page action.
After that the option to enable Greylisting doesn’t produce the error.