PFB steps for downloading blacklisted data as per the reason :

1. Login to the Panel
2. Click on DATA
3. Hover over CONTACTS
4. Click on BLACKLISTED CONTACTS
5. Choose the method of Blacklist Category:
a.Hard Bounce
b.Unsubscribe
c.Mark as spam
d.Others
After selecting Blacklist Category click on Search and then Export. (It's the arrow to
the right)

Post this, select the registered Email ID and then click on Begin Process.

You will receive a downloadable link in email to the email id selected.