Hello AD23_,
Thank you for using the Apple Support Communities. I see you're running into some issues with storage on your iPhone.
Are you seeing the "low storage" prompts when taking any other actions on your iPhone, or only when you try to download those apps?
Regarding your overall storage, iOS should manage your storage automatically when you run low. If it's unable to, as may be the case here, that's when you'll want to check out the "Recommendations" to free up some space. Do you have any other recommendations on that screen other than "Review Large Attachments?" You can find more about this, and other ways you might be able to free up space, under the "Use your iOS device to check its storage" section here: How to check the storage on your iPhone, iPad, and iPod touch
I hope this helps get you started.
Cheers.