Resolving Windows 8.1 Error Code 0x80070002: Missing File Issue

There are various methods to tackle the 0x80070002 error: File missing in Windows 8.1:

1. Utilise the Windows Update Troubleshooter: Navigate to Control Panel > Troubleshooting > System and Security > Windows Update and initiate the troubleshooter.
2. Remove the Software Distribution Folder: Navigate to C:\Windows\SoftwareDistribution, erase all contents within, restart your system, and attempt an update once more.
3. Examine your antivirus program: At times, antivirus programs might hinder Windows updates. Temporarily disable your antivirus and attempt the update once more.
4. Verify your internet connection: Ensure your internet connection is stable and retry the update.
5. Refresh Windows Update components: Launch Command Prompt with administrative rights and execute these commands sequentially:
   

    net stop wuauserv
    net stop cryptSvc
    net stop bits
    net stop msiserver
    ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
    ren C:\Windows\System32\catroot2 catroot2.old
    net start wuauserv
    net start cryptSvc
    net start bits
    net start msiserver

After completing these steps, reboot your system and try updating again.

6. If all else fails, consider a System Restore: Should the previous measures prove ineffective, consider restoring your system to an earlier date when it functioned properly.