Well I've tried with jdownloader and for the first disk the dlc container is 100% offline.
why don't you try it yourself, for example one of the link :
The following download is not available:
The file of the above link no longer exists. This could be for several reasons:
* The uploader deleted the file
* The file contained illegal contents and was deleted from our servers by our abuse-team.
* The file is incorrect
* The server is busy and can not process the request.
The file was deleted due to our inactivity-rule (no downloads).