Its not valid anymore: https://www.advancedcustomfields.com/blog/acf-5-0-release/
We are so excited to release version 5.0 that we’re also offering a HUGE 50% off discount on our PRO version!
Now thru September 30, 2018, ACF 5 PRO is available for half price using the coupon ACF50! It’s our way of saying “Thank You” for your continued support.
Hello, Is this coupon still valid? I absolutely need this plugin to work, but I’m on a budget. I looked for a coupon for your plugin on numerous sites that offer discount coupons, but was unable to locate one. I would like to request a discount on your product, and I promise you that I will be renewing your subscription at full price in the future.