Maintenance Tool reports corrupted installation

A month ago my MaintenanceTool complains with "Your installation seems to be corrupted. Please consider re-installing from scratch."

So i did. On Aug 18 I reinstalled Qt from scratch. After installing some basics I restarted and extended the installation with some other compilers and the source code.

Since the next start on Aug 24 the MaintenanceTool complains with "Your installation seems to be corrupted. Please consider re-installing from scratch." The installation path D:\Qt contains the file MaintenanceTool.dat.new. So the MaintenanceTool might not have finished all it's work.

I'll attach the InstallationLog.txt