Can you please provide the TPS3808G09DBVR footprint in Allegro v15.2? The footprint available on web is for Allegro v13.6 which is not compatible with Allegro v15.2.
Sorry for the delayed response.
Generally speaking, you should run DB Doctor to convert Cadence Allegro v13.6 footprints to any newer version. DB Doctor is part of the Allegro installation. It should be in the Windows start menu "Start -> Cadence SPB 15.x -> PCB Editor Utilities -> DB Doctor".
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