Distribution Servers couldn't upgrade to version 10

Distribution Servers couldn't upgrade to version 10

Hi,

I have a problem that distribution server couldn't upgrade to last version 10. when I go to Remote Offices log I found this error message:

Could n't replicate client-data/AgentUpgrader.exe; file download failed

what maybe the cause? even I excluded distribution server and agent folders from Antivirus scan.

thanks.
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