> I want to download a complete website via batch file or 
OLE.
> I have seen that it is possible to update a website 
project 
> via batch.
> So, what do I have to do to make it as easy as possible? 
Is 
> there any opportunity to say that the program downloads a 
> complete website without having created a project for 
this 
> website before?
Yes - such as:
httrack www.example.com -O "C:\My Websites\foo" +*.gif 
+*.jpg

You can list all options using httrack --help
or look at hts-cache/doit.log of an existing project

To update:
cd <directory>
httrack --update