FIX: api-ms-win-core-libraryloader-l1-1-1.dll is missing from your computer

For some time users can upgrade to Windows 10 using the Windows 10 Upgrade Assistant released by Microsoft. Using this tool users can easily upgrade to Windows 10 from Windows 7, Windows 8 and Windows 8.1 devices. The GUI (Graphic User Interface) makes it easy to upgrade. You can also download an installation disc using this tool, it’s commonly used and loved for it’s ease of use.

However, some users experience problems using this tool and receive the message that api-ms-win-core-libraryloader-l1-1-1.dll is missing on their system. In this short article we will help you solve this issue so that you can upgrade to Windows 10 as well!

You need to have administrative rights on your device to follow this guide.

Step 1: Finding wimgapi

The first step you’ll have to take it to find WimGAPI.dll on your system. It’s located in this System32 folder of your system.

  1. Open File Exporer
  2. Go to your operating system disk and then go to Windows
  3. Find the folder System32
  4. Scroll until you find the file wimgapi.dll or use the search box.
  5. Right-click the file and choose Copy

Step 2: Moving the file

Once you’ve found the file you can use it to resolve the error message you were receiving. Simply copy the file from the system32 folder and paste it in the Windows10Update folder.

  1. Go to your operating system disk and open the folder Windows10Update
  2. Right-click an empty location in the folder and click on Paste
  3. Replace the file if promted.

Step 3: Restart Windows 10 Upgrade Assistant

Once you’ve executed all the steps above, simply restart the Windows 10 Upgrade Assistant. No worries, all downloaded files will still be there and will not have to be redownloaded.

Yuri Pustjens
About the Author

2014, 2015, 2016, 2017 and 2018 Microsoft Most Valuable Professional Windows
Yuri specializes in troubleshooting (crash analysis and devices), system resource utilisation and system performance. He is also very interested in Customer Security. Yuri can be found as Windows Community Moderator and Wiki Author on Microsoft Answers and is active on different communities all across the web.

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