Create download button for iOS app
It's easy to create a download button for your iOS app that features the Apple logo. Navigate to this URL https://banners.itunes.apple.com/us/catalog
In the search term enter the app name and choose Apps from Media Type dropdown and click Search. Your app will show up in the search results as depicted in the below screenshot.
Click on the one that says Apps and start customizing the look and feel of the download button.