Default Installing CWM

Hi all, I am having great difficulties installing CWM recovery on my i9507 after I rooted my device with CF AUTO ROOT.

First I used this guide but got stuck with the .dll error when trying to run Heimdall. Even after I installed Visual Studio many times!

Next I tried flashing with Odin but only got a seandroid not enforcing error every time I did. I can still run my phone fine and my Knox warranty has still not been tripped.

I hope someone can help!