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Is that behaviour correct?

No.

Could you verify the downloaded package is indeed complete and fully OK? Usually a package will be re-downloaded if the date or size doesn't match. And sometimes Microsoft has contradicting information on their mirrors causing that behavior.

Hi!

DonDaniello wrote:It gets downloaded very long but seems to disappear then. I also tried with a new and clean directory with a fresh update generator.

Maybe a problem with digital signature verification (check download.log).
If so, you may want to turn off verification.

RTW