How to update Windows Defender mpsigstub.exe?

I'm trying to put together a script which will update Windows 7 with the latest Windows Defender Antivirus definitions. Microsoft continues to provide updates on their website , being most recently updated July 2021. Offline definitions can be downloaded and installed offline. This will successfully update the definitions file. However, it is not updating mpsigstub.exe , despite the updated file being contained in the definition update mpas-fe.exe . Windows Update will continue to report that the latest definitions are not yet installed but will reduce the file size to only a few hundred kilob

Question by Zhro on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.