I'm trying to get the DLC working on Android, but I'm unable to copy or move the rpa file to where the apk files are. I did check permissions and nothing is denied for my files, but it's stuck as a completely separate download that's unable to be moved when the other dlcs automatically went to the app as an update. Though that could be because the extension is different this time.
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Here's what the Android programmer says about that: to help add the DLC you can download an external file management app like Amaze File Manager (play.google.com/store/apps/details?id=com.amaze.filemanager) or to connect your phone to a computer to move/update the files.
You'll need to redownload and install the base game and any other DLCs you own to have them be up-to-date as well. I'm sorry for the trouble!