Hotfix for MSI 4.5
Microsoft release a hotfix for MSI 4.5. It addressed a problem where installing multiple msi packages in a row could result in error message "API call rejected - No actions in Context". It's caused by the Windows Installer engine starting the next setup while the previous one is still in the last finishing step. This issue is most likely to be encountered during the installation of SQL Server 2008. So in many cases you won't need to install the hotfix.
The hotfix requires MSI 4.0 or 4.5 to exist on the target machine. This means that you can install it on Windows Vista and Server 2008, even if the target machine hasn't been updated from MSI 4.0 to 4.5 before. On Windows XP and Server 2003 however you need to install the base version of MSI 4.5 before you can apply the hotfix.
The MSI version matrix on InstallSite (English / German) has been updated.