@uwe-dembski The drivers may not be compatible because you don't have the hardware or for some reason the driver does not apply to your system. There are two things you should do, first, you should enter your Service Tag when looking for drivers, and second, you should click on the 'View full driver details' link and look at the 'Compatible Systems', 'Supported Operating Systems', and 'Applies to" links.

Please give us an example of incompatible driver.

@uwe-dembski  Even when you use your Service Tag, be sure to move the little slider to the right so it only shows the drivers for your specific PC.

I did the above mentioned steps. 

The drivers are 

Intel-Rapid-Storage-Technology-Application_MC2YM_WIN64_18.1.1011.0_A12_01.EXE

Intel-Rapid-Storage-Technology-Application_MC2YM_WIN64_18.1.1011.0_A12

@uwe-dembski  The driver page says it's Intel Rapid Storage Technology application  18.1.1011.0, A12 but the actual file name to be downloaded is A12_01.EXE. So it may only be one driver that's a problem.

Download it again and try installing again. This time, right-click the downloaded file name and Run as administrator.

FWIW, Intel driver updates sometimes give an error message when the version being installed is the same version as the one that's already running, rather than saying "version already installed" or something similar. Don't know if that's the issue here...

Tue Mar 30 06:38:35 2021] Update Package Execution Started
[Tue Mar 30 06:38:35 2021] Original command line: "C:\Users\uwe-d\Documents\Programme\Dell_Treiber\Programme\u_Anwendung_Intel_Rapid_Storage_Technology\Intel-Rapid-Storage-Technology-Application_MC2YM_WIN64_18.1.1011.0_A12_01.exe"
[Tue Mar 30 06:38:35 2021] DUP Framework EXE Version: 4.8.6.93
[Tue Mar 30 06:38:35 2021] DUP Release: MC2YMA12
[Tue Mar 30 06:38:35 2021] Initializing framework...
[Tue Mar 30 06:38:35 2021] Data in smbios table is (hex)value = 3 , Chasis type (hex)value = 3 , System type is : Client
[Tue Mar 30 06:38:35 2021] logo.png
[Tue Mar 30 06:38:43 2021] User Command: attended
[Tue Mar 30 06:38:43 2021] DUP Capabilities Value: 35651583 (0x21FFFFF)
[Tue Mar 30 06:38:43 2021] DUP Vendor Software Version: 18.1.1011.0
[Tue Mar 30 06:38:43 2021] Local System/Model Compatible with this Package? Yes
[Tue Mar 30 06:38:43 2021] Local System OS Version: 10.0.0.0
[Tue Mar 30 06:38:43 2021] OS Compatible with this Package? Yes
[Tue Mar 30 06:38:43 2021] Local System OS Language: DE
[Tue Mar 30 06:38:43 2021] Language Compatible with this Package? Unknown
[Tue Mar 30 06:38:43 2021] Identified Behavior : attended
[Tue Mar 30 06:38:43 2021] Extraction-miniunz path: c:\PROGRA~3\dell\drivers\048CE5~1\miniunz.exe
[Tue Mar 30 06:38:43 2021] Extraction-arguments: -x C:\Users\uwe-d\DOCUME~1\PROGRA~1\DELL_T~1\PROGRA~1\U_ANWE~1\INTEL-~2.EXE -o -d c:\PROGRA~3\dell\drivers\048CE5~1
[Tue Mar 30 06:38:43 2021] Extraction-GetExitCode: 0
[Tue Mar 30 06:38:43 2021] Temporary payload log file name: C:\ProgramData\dell\drivers\048ce516-ea65-4a37-859d-54b99fb278ed\DUPC46C.tmp
[Tue Mar 30 06:38:43 2021] payloadExe: InstallApp.bat
[Tue Mar 30 06:38:43 2021] payloadArgs:
[Tue Mar 30 06:38:43 2021] payloadDir: C:\ProgramData\dell\drivers\048ce516-ea65-4a37-859d-54b99fb278ed
[Tue Mar 30 06:38:43 2021] MUP Spec version is less than 3 or Not a DCH Package.
[Tue Mar 30 06:38:43 2021] Legacy installation is selected. Calling Vendor Installer...
[Tue Mar 30 06:38:46 2021] Appending Vendor Software Log.
[Tue Mar 30 06:38:46 2021]
--- Start of Vendor Software Log ---

[Tue Mar 30 06:38:46 2021]
--- End of Vendor Software Log ---

[Tue Mar 30 06:38:46 2021] Vendor Software Return Code: 1
[Tue Mar 30 06:38:46 2021] logo.png

Try Version 17.0.2.1076

https://dl.dell.com/FOLDER05405003M/4/Serial-ATA_Driver_6W1FP_WN32_17.0.2.1076_A00_01.EXE

But this is exactly what i asked: 

Why are those drivers offered, when they are not compatible with my system?

@uwe-dembski  - I wonder if the problem is the language since you're using German:

Tue Mar 30 06:38:43 2021] Language Compatible with this Package? Unknown

@uwe-dembski  - Because it was probably assumed...

Have you tried downloading and installing that same update from Dell's German support page for XPS 8940? CAVEAT: I have no idea if that will make any difference.

I pinged my Dell tech contacts and provided the link to this thread.  So they should look into it...