Download All W/o Going Through Checkout?

Hi guys.  Trying to figure out how to allow a client to download all photos from a sub gallery at the same time without having to go through the checkout process. I did a search and can't seem to find a good answer. 

I've added the download sizes to a "buy all" and set the price to zero but still goes through checkout process. 

Thanks! 

I made a price list "Downloads", in the settings I changed it to "Require customers to be logged in, no".

I then made a "Free Download" in the Product Base which gives them the option to High Resolution or a resized social media ready file. I checked "free download" and ta da

Yes, free downloads.

Thanks, I tried that and it wasn't working.  But seems to now so apparently I messed up originally lol.  Got it working.  Thank you!