First, head over to www.steinberg.net/go to download and install the Steinberg Download Assistant for your platform.
Launch the Steinberg Download Assistant and follow the on-screen instructions to either create a new Steinberg user account (Steinberg ID) or sign in if you already have an account.
Please note that if a new account is created, a verification code will be sent to your selected email address. Enter that code to complete the account creation.
Once logged in, click on "Enter your Download Access Code" and enter the code provided to you by Audient which will follow the format as seen below.
Download Access Code: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
After the successful redemption, go to the "My Product Downloads" tab on the left to find the Cubase LE 12 and Retrologue 2 downloads. 
Select the product and click on "Install all" at the top of the list to the right to install the complete product package.
Select the product and click on "Install all" at the top of the list to the right to install the complete product package.
Once installed, please verify that the licences are activated. This is done in the Steinberg Activation Manager which has been installed as a separate application with the Steinberg Download Assistant.
Open the Steinberg Activation Manager from either your Applications Folder on macOS or from the Start Menu on Windows and activate the licenses. 
Cubasis LE 3 - Unlock Procedure
1. First, open the iOS App Store and search for “Cubasis LE 3”. Download this application to your device. 
2. Once Downloaded, open Cubasis. You may now see a notification telling you to connect a Compatible device to unlock Cubasis. 
3. Connect your EVO 4 or iD4 (MKI/MKII) to the iOS device and after a few seconds, Cubasis LE should unlock, allowing you to use all the features of Cubasis LE without any time restrictions.