The deadline for #3 ended in 2013. And #2 (later called Early Access) ended with the official release in 2016.
Crate has partnered with the Humble Store for the distribution of keys and benefits. They also streamlined the offering after the KS and switched you to the Patron Edition.
So for #1, #4 and #5 go to https://www.humblebundle.com/resender
- By default you will get keys for Steam.
- If you prefer GOG, go to https://support.humblebundle.com/hc/en-us/articles/218109617-Grim-Dawn-FAQ-The-Humble-Bundle-Edition- and scroll down to “Where is my DRM-Free copy of Grim Dawn?” for directions.
Claim your keys and redeem them.
- They second one is for your virtual goodies and is a special version of the Loyalist Pack #1. You will need to talk to Kory the Keeper in Devil’s Crossing to utilize them.
- The third one is an extra benefit - see Crucible DLC Keys for Kickstarter and Pre-Kickstarter Backers