It's sort of a miracle this works at all. The library in P10(2014) requires Adobe Flash.They didn't just stop supporting it. Whenever Flash phoned home they actively killed it. Flash was literally killed and tossed in a burning dumpster by Adobe in 2020. There's no getting it back. That looks like some sort of 3rd party library replacement like p3Do.

If you have a 64 bit version of Poser installed and a 64 bit OS you can try the external library ... It uses Adobe Air which is now Samsung Air and is also waaaay past end of life. It will eventually stop working too.