How to Redeem A Promo Code On The Mac App Store
If you got a promo code for certain app, for example: LGC5YHNR3LAY, you can redeem the code on the Mac App Store for FREE.
Step 1. Launch the Mac App Store, login with your Apple ID, in 'Feature' page, you can find 'Quick Links' section located on the right. Click 'Redeem'
Step 2. Enter or copy-paste your redemption code into the text field. (If you didn't login in step 1, you'll be prompted to sign in with your Apple ID in this step)
Step 3. Click 'Redeem' button
Step 4. You'll receive a thank you message telling you the certain app is being downloaded.
Note: Promo codes have an expiration date, usually 4 weeks from the date it was generated. So please redeem the code before the expiration date.