For now, you can render out frames as images  (ie:  .bmp, .png etc.)  then simple render the first 100 frames,  restart, render frames 101 - 200,  restart, render 201 to 300,  etc.  Poser should increment your files as it renders and saves

When all images are rendered, you can import them into your video editor and then save out as a video.

good luck