Yup, that's right: use coupon code BF2018FTW to get 50% off the first year of any Pro plan OR 50% off a one-year renewal of your current Pro plan because hey, it's Black Friday (or will be, or was ... guess it depends on when you get this email). Here's how:

If you're UPGRADING to a Pro plan ...

Log in to your Dashboard and click Upgrade

Look for the Coupon code box (just below the plans table)

Enter BF2018FTW in the box and click Apply

If you're RENEWING an existing Pro plan ...

Log in to your Dashboard and click Renew Now

Look for the Coupon code box (just below your plan details)

Enter BF2018FTW in the box and click Apply

Offer valid on ALL Pro plan upgrades (Basic → Pro Standard, Pro Standard → Pro Plus, etc.) as well as all renewals of existing Pro plans. Ends at midnight on November 30, 2018 (UTC) because this email probably landed in your spam folder and you're just now finding it like a week later.