[Q] Tried to unlock the bootloader and install TWRP... didn't go well.

I've become very tired of dealing with the stock Samsung ROM, so I decided to unlock the bootloader following this guide:

http://ift.tt/1SSv0Kt

Finished, so I decided to install TWRP via the TWRP application off the play store. Claimed to have been installed, so I went ahead and tried to boot into it. Then, a message comes up saying Verizon doesn't like the software I've installed, and wants me to take it to a store. Says "SECURE FAIL: RECOVERY" up top.

The knox kernal flag has been tripped as well, so I'm assuming I at least unlocked the bootloader correctly?

ANY help would be greatly appreciated. I'm trying to download a stock recovery image, but all the downloads seem to be painfully slow. (less than 50 kb/s)

Have a great day, even if you can't help! (:

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