The error regarding a missing api-ms-win-core-version-l1-1-1.dll file typically occurs on Windows 8 or 8.1 systems, especially after updating Microsoft Office 365. This specific DLL is part of the "Api-set" libraries introduced in newer Windows versions; because Windows 8 has reached its end of support, it may lack the native files required by newer software builds. Recommended Solutions

Common Error Scenarios

Users typically encounter this error when:

“The program can't start because api-ms-win-core-version-l1-1-1.dll is missing from your computer.”

1. Visit Microsoft’s official download page for “Latest supported Visual C++ Redistributable downloads.” (Direct links are safest from learn.microsoft.com)
2. Download both the x64 (64-bit) version. The filename is typically VC_redist.x64.exe.
3. Run the installer as Administrator.
4. If prompted, select Repair (if already installed).
5. Reboot your PC.

Reinstall the program, which may prompt it to "repair" its required DLL dependencies. ⚠️ A Warning on "DLL Download" Sites

Conclusion

1. Download the Microsoft Visual C++ Redistributable Package:

   Method 5: Perform an In-Place Upgrade (Last Resort)

   If all else fails, an in-place Windows upgrade repairs system files without deleting your apps or personal data.

   5.1 For Windows 10/11 (Most Common)

   Install or repair the Microsoft Visual C++ Redistributable (specifically 2015, 2017, 2019, or 2022), which installs the correct Universal C Runtime (UCRT) and API Sets.