Windows 10 setup stuck at preparing files on Dell Precision M6400 with Intel Rapid Store ICH9M-E Raid Controller

I tried to install Windows 10 on a Dell Precision M6400 laptop from an USB Boot Stick.
Everything went fine until Windows 10 setup stuck at the "Preparing files for installation" step. Tried this several times and it hung at different percentage levels, but never finished the step.

How-I-fixed-it:

I downloaded
Intel Rapid Storage Technology (Pre-OS Install) Driver
from
https://www.dell.com/support/home/us/en/19/product-support/product/precision-m6400/drivers
and unzipped it to my USB stick.

During the setup process choose "custom install" :

Then choose "Load driver":

Navigate to the Directory on the USB stick containing the driver and load it.

Continue with the setup.