Plesk update V7.5.3 -> V7.5.4 fails

[HerrB@]

Hello,

trying to update Plesk V7.5.3 to V7.5.4 using the Updater fails everytime with this error description (only the end of the report):

...
package psa-manual-custom-skin-guide (file /PSA_7.5.4/rpm_SuSE_9.1/opt/docs/psa-manual-custom-skin-guide-7.5.4-suse9.1.build75050824.12.noarch.rpm)
----

Retrieving standard packages
---

Retrieving Plesk files
6. Downloading https://autoinstall.plesk.com///PSA...e/psa-7.5.4-suse9.1.build75050824.12.i586.rpm (24 files to go)

File download failed.
Failed writing body
---
===> Autoinstaller: stopped logging at Mon Jan 16 16:22:01 2006

***** end of log file *****

Hints for solving this issue are highly appreciated. Thank you.

Regards,

HerrB