I was just about to try out the Blue Iris software when I received an error message saying “mfc140u.dll not found in Windows.” After trying to find the error, I discovered that Blue Iris requires the Microsoft Visual C++ Redistributable to run on Windows. After installing the latest version of the Microsoft Visual C++ Redistributable, Blue Iris finally ran smoothly on my Windows 11 operating system.
This guide will explain step by step how to resolve this issue and where to download Microsoft Visual C++ Redistributable.
What is Visual C++ Redistributable?
Visual C++ Redistributable is a collection of runtime components required by many applications developed with Visual Studio. These components enable Windows to run programs that depend on Visual C++ libraries. Installing the package ensures that compatible applications work correctly, even on systems where Visual Studio is not available.
When you install a version that does not match the application’s requirements, Blue Iris may fail to start and display the error message “mfc140u.dll was not found.”
Some error messages that appear:
- VCRUNTIME140.dll was not found
- MSVCP140.dll is missing
- The application failed to start because a required component is missing
How to Fix Blue Iris Error Code MFC140U.dll Was Not Found on Windows 10/11?
I’ve tried downloading the mfc140u.dll file from various websites, but none of them really solved the problem. Finally, I went to Microsoft’s official website to download the Visual C++ Redistributable.
Download Visual C++ Redistributable
Please click this official link to open the download page.
On that page, Visual C++ Redistributable, starting from version 2005, 2008, 2010, 2012, 2013, 2015 dan 2017-2026. In this guide, I chose to download the latest version of Visual C++ Redistributable, which is version 2017-2026.
Download according to your Windows PC architecture. I chose x64, and the file size is 17.9 MB.
Install Visual C++ Redistributable
It’s time to install Visual C++ Redistributable on your Windows. Open your Downloads folder and double-click the Visual C++ Redistributable installation file.
Check the box next to “I agree to the license terms and conditions.” Then, click the Install button.
Click Yes to confirm.
If the “Setup Successful” message appears, the Visual C++ Redistributable has been successfully installed on your Windows PC. Click the “Close” button to complete the installation process.
Already Installed Visual C++ Redistributable but mfc140u.dll Error Still Appears?
If the mfc140u.dll message still appears even though you have installed Visual C++ Redistributable, then it is time to take steps to reinstall Blue Iris.
After a careful reinstallation, the Blue Iris software finally opened on my PC and ran smoothly. For those of you installing this software for the first time, please pay close attention and make sure you don’t miss any steps. If downloading the Visual C++ Redistributable, make sure you download the latest version, which is version 2017-2026.
And this is the main page view of Blue Iris on Windows after successful installation and using the 2017-2026 version of the C++ Redistributable.
Conclusion
Microsoft Visual C++ Redistributable is an essential component for running many Windows applications developed with Visual Studio. It provides the runtime libraries required by C++ software, helping prevent missing DLL errors and improving application compatibility. If you encounter errors related to files such as mfc140u.dll, MSVCP140.dll, or VCRUNTIME140.dll, installing the appropriate Visual C++ Redistributable package is often the most effective solution.
In this case, Blue Iris requires the latest Microsoft Visual C++ Redistributable file, namely version 2015 and above.