> 1. Using the latest 'no-inst'-Version for Windows 
produces 
> an error message that the zlib.dll was not found in the 
> path. 
> In former versions that was not a problem: just unpacking 
> the file and run the .exe worked very well. Now it 
doesnt. 
> Why?
Copy all dll/* files in your WINNT\SYSTEM32 folder, or in 
your httrack folder

> 2. With the former versions I sometimes tried to mirror 
> large sites. But somewhere around 500 MB HTTrack aborted 
> with some sort of error message. Is there a limit in 
> HTTrack? 

100,000 links by default ; more using -#L option (such as -
#L2000000) or using the 'Set Options'/'Limits'/'Maximum 
number of links' option