Hi, @Duchemin, Dominique
Thank you for posting in Microsoft Q&A forum.
Here is a guidance that cover the process for removing expired updates from SCUP 2011 console.
Although it is a bit old, you may check to see if it helps:
https://patchmypc.com/scupcatalog/documentation/CleaningUpExpiredUpdates.pdf
(Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.)
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