During major Windows 10 Feature Updates the install of HashCheck gets clobbered and needs to be reinstalled.
Update the installer (or change installers) to save HashCheck in a location that will survive major feature updates.
This is a low priority since it's rare (happens one update/year) and is fixes with a quick reinstall.
I can confirm that this happened to me when I updated from Windows 10 to Windows 11. I guess during a major upgrade such as that, the "C:\WINDOWS\system32\ShellExt" folder gets deleted (for whatever reason).
During major Windows 10 Feature Updates the install of HashCheck gets clobbered and needs to be reinstalled. Update the installer (or change installers) to save HashCheck in a location that will survive major feature updates.
This is a low priority since it's rare (happens one update/year) and is fixes with a quick reinstall.