CobraMode 18 August 2021 Collection
This collection is only available as part of the Heliana's Guide to Monster Hunting Kickstarter campaign. You can late pledge to the campaign here: https://www.kickstarter.com/projects/saltybot/monsterhunting5e
Once you late pledge, you will get access to the campaign updates. If you look at the updates around September, you should be able to find the information to download the collection there.