Hi Camelia,
The mfc140u.dll missing error occurs when applications requiring Microsoft Visual Studio 2015 (MFC library) cannot find this file, usually resolved by installing the Microsoft Visual C++ 2015 Redistributable.
Please download and install both the x86 and x64 versions from Download Visual C++ Redistributable for Visual Studio 2015 from Official Microsoft Download Center to fix the error.
I hope that above information is helpful to you.