The /MediaArch x64 argument specifies that MCT downloads a 64-bit Windows 10 Enterprise edition – and in this case, v1909. If you need a 32-bit Windows version, change it to /MediaArch x86.
Following are the client versions of Windows 10. When upgrading from Windows 7 or 8.1, Microsoft delivers Windows 10 with the same CPU word size (32 or 64 bit ... The Pro version adds data ...