The activation of this app is so adorably cute I can not help but describe it somewhere.
The activation window inside the application just concatenates the E-Mail and the Order ID input fields and hashes them with md5.
import hashlib
email = b"me@example.com"
order_id = b"00001"
hashlib.md5(email + order_id).hexdigest()
The resulting hash is the activation key you have to enter as "Your Code".