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Is he picking the "Choose texts" icon in texts and words? And then he does not see "Bible" as a possible item to open up and select texts from?
If that is the case he should double check the association in project properties in Paratext. It should look like this (with no red exclamation point by the FLEx project name. The option "Interlinear does not use Associated Lexical Project" is not relevant here, that determines whether the Paratext interlinearizer looks for words in FLEx or not).