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I have downloaded the most upgrade Xcode, and this material does not match my Xcode. What should I Do??
What can I do solve this problem? why these material are not up to date???
Highly doubt these will be updated as they no longer have a staff iOS Developer - they closed down the iOS Tech Degree last year too and closed it down fully in January. I wouldn't worry too much though - if you Google any issues you have, or post any code that produces errors or can't build here / stackoverflow etc you can still get value out of the content.
I know the IOS courses are outdated, I would say even though it is pretty different, you should not have problem completing this course.
I don't think, maybe we could try to reach treehouse staff.