Chord scale purchase/restore not working in iMac running OSX 10.9

I successfully purchased, used and have been charged for Chord Scales on my iPhone 5. Tried to download to my iMac using the Restore Previous Purchases function and got the message below. Also tried to make a new purchase and got the same message. Running OSX 10.9. Using same Apple ID and PW for all these transactions.

App Store Message:

This is not a Test User account.
Please create a new account in the Sandbox environment. [Environment: Sandbox]