I hit this error on one of the multiple rounds of updates on a Windows 7 Professional 32 bit install.
On doing a spot of googling, it seems this was caused by a missing Service Stack Update (KB4490628) from March 2019. It seems the machine could download and install updates prior to that date, but was unable to install updates released after that date, hence generating the above error.
Installing KB4490628 from Microsoft Catalog (via the above link) solved this problem and Windows Update was then able to continue downloading and install the remaining updates.
If this helped you, or you have any other insight into this error, feel free to comment below.
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