We wish we could, but this is out of our hands because it is not an option that Apple makes available for App Store customers.
Unfortunately, we are unable to offer App Store users discounted upgrade pricing, or free updates to those who purchased three months prior to release.
If you purchased Scrivener or Scapple from the Mac App Store or iOS App Store, this is how updates work: (Windows users don't need to read this section, as this only applies to our Mac App Store customers.)
SCRIVENER 3 DISCOUNT FOR MAC
(If you have changed email addresses since then, email us and we can sort it out for you.) Updates for Mac App Store and App Store Customers To get the reduced pricing, you simply enter the email with which you purchased the prior version of Scrivener (or licence key depending on the prompt), and you will then automatically be taken to the store with the discount applied. When we release a major update, we make an "Upgrade" page available (you will find a link to it on our website and in our store). The discount price will be set at the time of release, but as an example, Scrivener 3 on the Mac is $49, but registered users of Scrivener 2 for macOS get a 45% discount. If you purchased the previous version of the software earlier than that, you receive a major discount on the regular price.