Copying the whole runtime folter is a bad idea(tm). The runtime folder is not just objs and tifs but contains also a couple of vital libraries and ressource files for Poser itself. If you want to copy the old runtime folder instead of just adding it, take a look at the folder names inside the runtime and see what contains content and what not. The names are obvious (libraries, geometries, textures, etc). Don't touch folders like ui.