Hi LimeZu,
I recently purchased this in the bundle sale listed here:
https://itch.io/s/28728/battlers-overload-100-rpg-enemies
However, I was only able to access the regular Fantasy Battlers - Free download. I wanted to let you know in case this wasn't intentional. (I suspect you intended for the complete pack download to be unlocked instead.)
EDIT: For now I just bought this pack again to unlock it as a work around. You can just keep the extra payment as tip, no big deal. :)
I mainly wanted to let you know it doesn't unlock through the bundle purchase. For the record, I had "purchased" the free demo version before trying to buy the bundle, so that might have confused itch.io.