I have just purchased the Max Lucado Essential Bible Study Library libronix disc and if anyone else has done the same it appears that the resources are not recognised by the Logos 4 "cloud".
The files have to be loaded from the disc into Logos 4, with no files being available for mobile devices or being installed by way of thne update now command, so if you lose the disc (or forget that you have to) you will lose the files on reinstallation.
I think this is down to the files being labeled as "updated" with the Logos 4 files not having this anotation, I am chasing this up with support and hopefully something can be sorted out.