Each time a breach like this happens I want to download the file and check if

1. My emails are in the dataset, and

2. Any of my passwords are in that dataset.

I really just want the collection of passwords so that I can use it as a check against any of my current passwords.

[EDIT: I know about haveibeenpwned.com; I'm not asking for a service that I send a http request to to determine if a single username exists in the db, I want the db itself so I can chuck it into sqlite and check multiple records at a single time, quickly, for both usernames alone and passwords alone

I also believe it's a bad idea to ask a third-party to perform the check. Even if you trust that third-party now, there is no way to ensure that trust in the future - i.e. it gets bought, breached or pwned itself in the future and best case scenario is that the record of your username lookup is available as "confirmed". Without visiting that site, no one would never know if that record was a throwaway or not.]

Services already exist that does this. Some password managers will check but the popular service often talked about on here is https://haveibeenpwned.com/

Thank you, I've edited my comment to be more specified