When you try to upgrade to Windows 10 from a Windows 7 computer using the WIndows 10 Update Assistant tool, the following error may pop up:
The program can’t start because api-ms-win-core-libraryloader-l1-1-1.dll is missing from your computer. Try reinstalling the program to fix this problem.
Precisely, the error message referencing the module api-ms-win-core-libraryloader-l1-1-1.dll occurs when upgrading from Windows 7 to Windows 10 Fall Creators Update v1709 using the update assistant utility from Microsoft. This error occurs because Microsoft seems to have packaged the wrong version of a DLL into the upgrader app. And the ultimate fix is to replace C:\Windows10Upgrade\wimgapi.dll with the one from C:\Windows\System32\wimgapi.dll.
- Open File Explorer and browse the
Windows\System32folder - Find the
wimgapi.dllfile. Right-click and select copy. - Browse the
C:\Windows10upgradefolder - Right-click on the folder background area, and click Paste.
- You’ll then be asked if you wish to replace the
wimgapi.dllfile with the new one. Select Yes. - Close the folder(s) and re-launch the upgrade assistant.
The upgrade should now proceed smoothly!
See also: What is Windows10Upgrade folder and can I remove it?
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This works fine.
Thank you Ramesh
deleted file by mistake installed windows 10 in past but now asking me to down load api-ms-win-core-libraryloader