This built-in tool scans your Windows computer for inconsistencies, which may be caused by various hardware failures or by software issues and potentially fix that corruption.  In the case of system inconsistencies and corruption, you can use the Deployment Imaging and Servicing Management (DISM) tool to update the files and correct the problem.

Fix Windows Update error 0x800F081F

We have already seen how this tool can help resolve these installation errors by a corrupted Windows Component Store: Today we will see how to use this tool to also fix Windows Update error 0x800F081F. Open an elevated command prompt, type the following and hit Enter. Once the operation completes successfully, type the following, and hit Enter.

Restart your computer and run Windows Update again. In case this does not help, you can try the Windows Update Troubleshooter or check these post on how to troubleshoot Windows Update errors: Hope something helps!