1. If you do not use any of the (default) Packagizer features at all and want to DISABLE this Setting, go to Settings --> Advanced Settings --> PackagizerSettings: Packagizer --> Disable this setting
or
2. Open a JDownloader with GUI and set your Packagizer settings as described at the beginning of this article.
Then go to Settings --> Advanced Settings --> PackagizerSettings: Rule List --> Copy everything in "Value"
In myjdownloader, go to Settings --> Advanced Settings --> PackagizerSettings: Rule List --> Paste the data you've copied from your other JDownloader here
To re-enable this Setting, simply repeat this process.