For example, let's say you have 100,000 links and content on your site.
The site is blocking crawling bots, so crawling more than 1500 will result in
an IP block.
To avoid this, I want HTTrack to pause after processing 1000 links, and then I
want to use a VPN and continue working with another IP. I can write a simple
macro to do this, but the important part is "HTTrack pauses after processing
1000 links".

How can I do this?