MSVCP140.dll?

I installed the file correctly as 64 bit like my laptop has

Nevertheless, there's always an error message that the file is not on it

Why is that?

"The file" is normally not installed, but the entire runtime:

https://support.microsoft.com/...-downloads

And the direct way to download the Redistributables from MSVC 2015:

https://www.microsoft.com/...x?id=48145

Better to download it directly from Microsoft. Loading a single DLL from the network is less trusting.

I've already installed everything and still get the error message

In which program? Have you ever restarted your computer (although it shouldn't be "actually")? If it's 32-bit software, you'll need 32-bit runtime (x86). I don't mean what version of Windows you have.

The redistributables for MSVC 2015 are available here: https://www.microsoft.com/...x?id=48145. In your link is the file for MSVC 2015, 2017 and 2019 with the note:

For example, installing the Visual C ++ 2019 Redistributable affects programs created with Visual C ++ 2015 and 2017. However, installing the Visual C ++ 2015 Redistributable does not replace the newer versions of the files installed by Visual C ++ 2017 and 2019 Redistributables.

The files are not identical. Which one would be more recommendable?!

Good idea: You can also install 32-bit software on 64-bit Windows. Then you also need the 32-bit redistributables.

I have a 64-bit system so do I have to take that with (x64) or not?

No.

Rather?

If it's 32-bit software, you'll need 32-bit runtime (x86). I mean
not what version of Windows you have.