I set up X-CUBE-MCSDK_v5.0.3 from st.com.
MCSDK 5.0.3 is seen as 5.0.2 in About windows.
X-CUBE-MCSDK is a combination of the firmware library + the ST Motor control Workbench.
The version printed in the About window is the workbench's version.
If you generate the code you will see a detailed version of the various parts (see attached picture).
5.0.3 refers to Firmware library.
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