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Poser - OFFICIAL F.A.Q (Updated: 2020 May 06 10:25 am)
Subject: Installed adobe flash player, poser 9 does not show poser content library
You don't say if you're on Windows or Mac.
Finding an older version of Flash and the newest update for Poser 9 might work, but unfortunately the only real solution is to upgrade. Flash is going away very soon.
Another possibility is to use Windows Explorer instead of the file library. It's a bit cumbersome, but it works.