This has been fixed
This article applies to:
(!) The article does not apply to Acronis Backup & Recovery 10 Online users in all other regions.
(!) The article does not apply to Acronis True Image Home.
European Acronis Online Backup Servers will undergo a planned maintenance on November 15th 2010 9AM - 3PM CET.
Clean the temporary folder and reattempt the installation
(!) For complete information on how to analyze installation logs, please see Analyzing Installation Logs of Acronis Products Based on MSI Technology.