If you have time, you can get everything from the API. Get the latest ID, iterate down and download the comments.
Does the API even work anymore? I'm getting prompted to login to Google when trying something like "https://hacker-news.firebaseio.com/v0/item/28065009"
Here's the current page as seen by the API.
https://hacker-news.firebaseio.com/v0/item/28060112.json?pri...
See also https://github.com/HackerNews/API