Yes, you are completely right ! This is because of the weird behaviour
of the QNX setup. In fact, when it says to remove the cd before
rebooting, we must leave it in instead. If we remove it as it says,
it doesn’t install the second part.
That’s a big problem for those who don’t know about this, and I hope
it will be fixed in the upcoming 6.3 version
Thanks to all who helped me find why so many files were missing