>>>It happens - for whatever reason - that one of the updates fails to install.
>>>Once you do the update again all goes well
>>
>>How should I do it again? Is there a possibility of only re-applying the particular failed update?
>
>If it failed to install, then it will be in the list of updates again. You can uncheck the others before doing the update

So far it's not in the list. May be next big update but I doubt.