Hi @Laurent Weinquin ,
If we do not need to download update from Microsoft server, please uncheck this option of No deployment Package during deploying.
As the products shown in the pictures, we could get the third party by referring this article, which is a step by step SCCM third-party software updates setup guide for all SCCM admins.
https://www.anoopcnair.com/sccm-third-party-software-updates/
Note: the above links are not from MS, and just for your reference.
After syncing, we could get similar updates:
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