Might try the manual steps here.
--please don't forget to close up the thread here by marking answer if the reply is helpful--
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We have cleared the Windows update logs. Verifiied GPO and Sec pol with other servers, we stopped the update service and ran %windir%\SoftwareDistribution\DataStore, plus cleared the windows update log. In a I verified that the GPO and Sec Pol's are the same as other servers. Below is the typical error: \SoftwareDistribution\Download\5ba27aec4fae28f8df1751f4d2884186\windows8.1-kb5029368-x64.cab (full file).
2023-09-11 01:25:15:866 1004 5a4 IdleTmr WU operation (DownloadManagerDownloadJob) started; operation # 282; does use network; is not at background priority; will NOT stop idle timer
2023-09-11 01:25:15:866 1004 5a4 IdleTmr Incremented idle timer priority operation counter to 25
2023-09-11 01:25:15:866 1004 5a4 DnldMgr *********
2023-09-11 01:25:15:866 1004 5a4 DnldMgr ** END ** DnldMgr: Begin Downloading Updates [CallerId = AutomaticUpdates]
2023-09-11 01:25:15:866 1004 5a4 DnldMgr *************
2023-09-11 01:25:18:897 1004 5a4 Report CWERReporter finished handling 2 events. (00000000)
2023-09-11 01:26:00:414 1004 1780 DnldMgr BITS job {8AF07AA3-A4DD-4C7D-9361-246843C4D6CB} completed successfully
2023-09-11 01:26:00:414 1004 1780 IdleTmr WU operation (DownloadManagerDownloadJob, operation # 165) stopped; does use network; is not at background priority; will NOT start idle timer (task did not previously stop it
2023-09-11 01:26:00:414 1004 1780 IdleTmr Decremented idle timer priority operation counter to 24
2023-09-11 01:26:00:586 1004 1780 Misc Validating signature for C:\windows\SoftwareDistribution\Download\41dd46540ae220c1b6032cd0f69ced07\Windows8.1-KB5018476-x64.cab with dwProvFlags 0x00000080:
2023-09-11 01:26:11:055 1004 1780 Misc FATAL: Error: 0x80096005 when verifying trust for C:\windows\SoftwareDistribution\Download
Might try the manual steps here.
--please don't forget to close up the thread here by marking answer if the reply is helpful--
The error occurs whether we use a WSUS or download and run the file locally.