I found a solution for the problem on ps4. If you want to access the whole pack of add ons for just cause 4, you have to pay $30 first. Then, you have to go back to the store and look for the individual add ons that are part of the pack. You can download each one for free after you purchase the pack. I think they designed it this way because many people were experiencing issues with the expansion pack. That's why you don't see it in your downloads after you buy it.