 your current one. Instructions for installation of the Appliance can be found here
No. Simply follow the instructions above to download and install the new appliance.
While not required, using the Appliance is highly recommended to make setup for the course easy and hassle-free.
Yes, but be aware that some problem sets are different this year.
Take some deep breaths and reach out to your classmates via CS50x Helpers, Facebook, Reddit, CS50 Discuss, or Twitter. Many people are willing to help you, and we don't want you to give up.
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“Demanding, but definitely doable. Social, but educational. A focused topic, but broadly applicable skills. CS50 is the quintessential Harvard course.”From the CS50 website
“CS50 is exceptional for its size, its resources and the cult of personality around its charismatic leader. It is more than just a class at Harvard; it is a cultural touchstone, a lifestyle, a spectacle. This is CS50, and it’s here to stay.”From the Harvard Crimson