Introduction:

The article describes the bug by start the custo diagnostic Client from the Windows 7 PC.

Problem:

by Start custo diagnostic, he comes the dialogue:

The "api-ms-win-crt-runtime-I1-1-0.dll is missing

Solution:

Install the follow Windows package: https://www.microsoft.com/de-de/download/details.aspx?id=48145

or:

you install the Windows update KB2999226.