If you bought before making an account, do this:

1. Click the button above to make an account with the same email you used to buy.
2. Now, go to your inbox and search for your order receipt.
3. Click the download link in that email.
4. On that page, there should be a button at the bottom. Click Get Started.
5. Enter your email, confirm it and then you're done!

Can't find the receipt email? Email rystalmail@gmail.com and I can resend the link.