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netinstall problem -- corrupt alsa-utils-1.1.0-10.el6.i686.rpm?

Hello.

I try to install from the netinstall iso file. Everything works as I
expect up to the screen where I have to choose between "Desktop",
"Minimal Desktop", "Minimal", etc.

If I choose either "Desktop" or "Minimal Desktop", I have a pop up
saying "Installation Starting" with "Starting installation process",
and, about a few seconds afterward, an "Error" pop up that says:

The file alsa-utils-1.1.0-10.el6.i686.rpm cannot be opened. This is
due to a missing file, a corrupt package or corrupt media. Please
verify your installation source.

If I choose "Minimal", this is the same except that instead of the
alsa*.rpm, it is iputils-20071127-24.el6.i386.rpm.

I have successfully used this installation procedure in the past,
literally tens times (last time in January). Since it says "verify
your installation source", I have now tried again with

CentOS-6.10-i386-netinstall.iso
CentOS-6.9-i386-netinstall.iso

on two different USB sticks, written with unetbootin and
livecd-iso-to-disk on two different computers. I also have a DVD with
some former CentOS version (perhaps 6.4).

I have tried the installation on 3 different computers (on one of
which the procedure worked in the past). Every time it is the same.

NB: during the installation process, the URL I enter is
<a href="http://mirror.centos.org/centos/6/os/i386/" title="http://mirror.centos.org/centos/6/os/i386/">http://mirror.centos.org/centos/6/os/i386/</a>

Any "chance" there is a problem on the CentOS side?

Otherwise, what could I be doing wrong now?

Thank you very much.

Regards,
Alain Cochard