Can not launch UE4 showing "can't start the program because api-ms-win-crt-convert-[1-1-o.dll is missing from your computer" how to solve the issue

Hi! There is already a post about the problem you are describing.

Check it here:
MissingDll

I think something gone wrong at the time of the installation of the Unreal Engine. You can try to verify the installation from the Epic Launcher and if the problem persist, I think that the missing .dll says that you didn’t install Visual C++ 2015 Redist as mentinoned in the above post.