Poser 11 has no problem with large multi-decade content runtimes (known to handle 335Gb). Though it may take a while to fully index and thumbnail, after a fresh install. You'll see the library's yellow disc icon pulsing, which means it's still indexing.

If you still have the third-party PZDB library installer and an old licence, you should also be able to get that registered - the licence server is still active though there are no longer any new sales. Another good library option would be the Adobe AIR External Library from Poser 2014 (this still works to drag-drop to Poser 11). To get that, just install Poser 2014 alongside Poser 11. They co-exist happily.

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Learn the Secrets of Poser 11 and Line-art Filters.