The Norconex Crawler Core is a library containing features and reusable code shared between all crawlers. It is not an executable application.
If you are looking for a web crawler, filesystem crawler or else, check out Norconex Web Crawler or Norconex File System Crawler.
Use this library if you are interested to build a new crawler, or if you want to replace the Crawler Core version you have with your downloaded Crawler zip file with a more recent one.
Refer to the API documentation for many of the features that are shared features between all crawlers.