The update procedure via the Internet (from 1909 to 20H2) uses additional files
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Update Windows 1909 (18363.1556) ends with update failed to install with error code 0x80d02002. On the client there are files in the folder ...SoftwareDistribution\Download...: WindowsUpdateBox.exe (21 Mbyte) and 19041.264.200511-0456.vb_release_svc_refresh_CLIENTCONSUMER_RET_x64FRE_ru-ru.esd ( 0 Mbyte). On the wsus WindowsUpdateBox.exe (21 Mbyte) and 19041.264.200511-0456.vb_release_svc_refresh_CLIENTCONSUMER_RET_x64FRE_ru-ru.esd ( 3,19 Gbyte). I can't understand why the client can't download update from wsus.
The client even has direct access to the Internet
Using the download mode:bypass results in update error 0x80244019