Hello,
the error-dialog refers to a file used for the installation of the HTML-help.
Maybe the setup-files yozu are using are damaged.
Please stop the setup process and try it again without selecting the packages for the HTML-help.
If the problem occurs again please send a problem description to the official support address
support.automation@siemens.com with the information which product and version you are using in the header of your mail.
Please notice that the ETM Portal does not substitute the common PVSS/WinCC OA-support.
Best Regards
Leopold Knipp
Senior Support Specialist