What is a program code?

Do you have a program code and are not sure how to use it? 

Program codes can be of two types:

1. Discount code -- allows purchasing subscriptions at a discounted price

2. License code -- entitles owner to a full subscription (given by employers/teachers/3rd party)

Please check the articles below for more information: 

- I have a discount code and I already have an account

- I have a discount code, but no account yet

- How do I use a license code?