Hi @SEBASTE , Welcome to the Lightroom Community forum! To better help you with this issue, we would like a few more details. Can you send your system info, a screen recording of the issue, and a numbered list of the exact steps needed to replicate it? You can find your system info by going to Help > System Info, copying and pasting it into a text file, then attaching the file here.
In the meantime, we can try a few things:
Can you check that your internet connection is stable and working? A poor connection can interrupt the update process.