Hi Kiriki,
the App Build Environment is integrated in ctrlX WORKS since Version 1.14. It is not available in older versions.
Anyhow, you can just download the SDK 1.12 from GitHub and still use this version in an App Build Environment which was created with a newer Version (e.g. 1.20). Then you would have to download the SDK manually from GitHub and unzip it in your App Build Environment.
Best regards,
Nick
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