Api-ms-win-core-crt-l1-1-0.dll - Microsoft Visual C++ 2015 Redistributable (vc_redist.x64.exe and vcredist_x86.exe) fails to install

Question

After probably the installation of an outdated program messsed up some libraries, the window "Missing Api-ms-win-core-crt-l1-1-0.dll" popped when starting particular programs.

As solution the installation of "Microsoft Visual C++ 2015 Redistributable (vc_redist.x64.exe and vcredist_x86.exe)" is recommended. However, this installation permanently failed.

Also the installation of Visual Studio 2015 itself failed, because the necesssary KB2999226 also faild to install. Manual installation of KB2999226

wusa.exe Windows6.1-KB2999226-x64.msu /extract:XXXX

DISM.exe /Online /Add-Package /PackagePath:XXXX\\Windows6.1-KB2999226-x64.cab

seemed to work (package successfuly added) but did not help. Visual Studio 2015 and vc_redist.x64.exe failed to install.

Answer 1

Here is what finally helped: Re-Installation of SP 1 for Windows 7.

As a matter of fact my system already had SP 1 for Win 7 installed. But obviously some fixes seemded to be broken. Re-Installation (Repair) of SP 1 for Win 7 helpd. After that, KB2999226 still did not install, but vc_redist.x64.exe and vcredist_x86.exe did and the "Api-ms-win-core-crt-l1-1-0.dll" problem disappeared.

To be on the safe side try this:

Re-Install SP 1 for Win 7
manually install KB2999226

wusa.exe Windows6.1-KB2999226-x64.msu /extract:XXXX DISM.exe /Online /Add-Package /PackagePath:XXXX\\Windows6.1-KB2999226-x64.cab

Repair: vc_redist.x64.exe and vcredist_x86.exe

If that doesn't work just try steps 1. and 3. (leave manual installation of KB2999226 out)