set Download Service Class
@JvmStatic()
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Sets the download service class which should be used. It is not allowed to change the download service after it was set once. This includes using this method or generating an OfflineContentManager by calling OfflineContentManager.getOfflineContentManager. downloadServiceClass must extend BitmovinDownloadService.
You may call this method multiple times, but never with a different service class.
Throws an IllegalArgumentException When the download service class was already set and a different one is passed.