To fix NSIS Error - Error launching installer or Installer integrity check has failed on Windows, rename the setup file and then move it to a different location.

Microsoft is pushing out a Windows 10 KB5001716 update used to improve Windows Update that is ironically failing to install, showing 0x80070643 errors.

If you try to deploy the DISM on Command Prompt with insufficient permissions, you can get the 0x800F082F error, and the tool might not even work at all. Windows system file issues.