Update README.md

Author: manhtai

README.md

@@ -51,18 +51,11 @@ We believe in a transparent and fair world, so we open-source the app and
 you get a trial version for your personal use, but if you find the app helpful,
 please make a purchase.
 
-### From Gumroad
-
 - Purchase page: https://gum.co/plainmerge (accept Debit/Credit cards and PayPal).
 - After purchasing, you will get a license key from Gumroad. Use that key to register the app.
 
 One-time fee. Multiple platforms: macOS, Windows, Linux.
 
-### On Mac App Store
-
-[![appstore](https://user-images.githubusercontent.com/8898656/212871568-bfb5bd39-716d-43a4-b3ed-0f48fbee3f41.svg)](https://apps.apple.com/app/pdf-mail-merger/id1664125232)
-
-One-time fee. For macOS only.
 
 ---