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Certain Inspired Acoustics pipe organs require a license activation within Hauptwerk v5. The error message 1223 indicates that the license activation might have been done, but Hauptwerk was not yet updated with the latest License package files, and that prevents installation.

To solve this issue, please 

1. Make sure you have the license installed for the product you purchased in your iLok account. If you do not see the license for your organ there, please redeem your license by entering the activation code you received from us.
2. Download the latest licensing packages from the Milan Digital Audio through their website: https://www.hauptwerk.com/licensingpackages/
3. Start Hauptwerk V, install the Licensing Package and then install the organ file that gave the error originally.