AMD Athlon 64 based system (K8 microarchitecture) hangs when AMD Cool'n'Quiet
is turned on in about two hours after booting the system.
Solution: turn off AMD K8 Cool'n'Quiet in BIOS.

Additional info: during installation process stops with a message "Wrong
digest", especially with a huge files, such as "kernel-firmware". Testing DVD
image shows errors. Updating BIOS and other measures had no effect.

After disabling AMD K8 Cool'n'Quiet in BIOS dmesg shows:

---------------------------------------------------------------------------
powernow_k8: [Firmware Bug]: No compatible ACPI _PSS objects found.
             [Firmware Bug]: First, make sure Cool'N'Quiet is enabled in the
BIOS.              
             [Firmware Bug]: If that doesn't help, try upgrading your BIOS.  
---------------------------------------------------------------------------

This problem is also observed with a Leap 42.3.