Hope this is helpful for you.
To download an earlier version of an app, follow these steps:
Open the Mac App Store.
Go to the Purchased screen on the Purchases tab on your Mac.
Find the app and choose Download. You'll see a message telling you if a compatible version is available. Tap Confirm to install this version.
If a compatible version isn't available, you can try contacting the app developer. Look for contact information on the app's product page in the Mac App Store.