Hi there, kjlaky.
I see that you're having a problem adding a boarding pass to the Wallet on your iPhone. You receive a message that Safari can't download the file, and I'm glad to help.
How to use Wallet on your iPhone, iPod touch, and Apple Watch -- See if there's a Wallet-enabled app to add your boarding pass to the Wallet on your iPhone.
Restart your iPhone, iPad, or iPod touch -- If there isn't an app available, restart your iPhone. Once it's returned to the Home screen, see if you can add the boarding pass now.
If this doesn't correct the problem, please describe the issue in greater detail. Please include the full text of any messages you receive. The more information you provide, the better we'll be able to offer additional guidance.
Let me know how that goes, and take care!