Upgrade from 7.1.6 to 7.5.2

[Ambit]

I'm trying to upgrade plesk to 7.5.2 but the installation hangs.

This is de last thing that the installation will do:

Trying to install cgitory applications... ==============Installing package AdvancedPoll-2.03-1
==============+OK
==============Installing package AutoIndex-1.5.1-2
==============+OK
==============Installing package CSLH-2.9.8-1
==============+OK
==============Installing package Coppermine-1.3.2-2
==============+OK
==============Installing package DocFAQ-1.71-4
==============+OK
==============Installing package Mambo-4.5.1-4
==============+OK
==============Installing package Nexellent_SiteBuilder-1.1-1
==============+OK
==============Installing package Owl-0.73-3
==============+OK

I will need to abort it with ctrl-c. And restore my backup.

Does someone have a suggestion / solution?

Thank you in advance.

Maarten