Hmm, at least the name should still be the same.

There's hardly anything in my PP-2012 runtime and all my content is spread over a couple dozend small runtimes.

I'd simply copy over all content of those multiple main runtimes into a single one, delete the duplicates and then sort that runtime out.

Perhaps delete older versions of Poser and just keep a runtime for legacy figures. (Still have a small Poser 4 runtime for nostalgic reasons)

"EVERYTHING" by voidtools.com is a great search engine to find stuff on a Windows machine FAST.

Couldn't be without it.