SaxonC-PE 12.4.2: trying to follow Saxonica setup instructions, but failing the installation test

Question

Trying to follow https://www.saxonica.com/saxon-c/documentation12/index.html#!starting/installing/installingWindows, I made these steps:

1. Dezipped libsaxon-PEC-windows-x86_64-v12.4.2.zip into C:\Program Files\Saxonica\Saxon1242
2. Added C:\Program Files\Saxonica\Saxon1242\libs\win to the system environment variable "Path"
3. Added saxon-license.lic to C:\Program Files\Saxonica\Saxon1242\libs\win

Trying then to follow https://www.saxonica.com/saxon-c/documentation12/index.html#!starting/running, I made these steps in cmd:

1. changed directory to C:\Program Files\Saxonica\Saxon1242\samples\cppTests
2. executed build-windows.bat - result: 'cl' is not recognized as an internal or external command...
3. executed testXPath.exe - result: 'testXPath.exe' is not recognized as an internal or external command...

My system: Windows 10, 64-bit

Your suggestions welcome. Kind regards.