"Out of memory" doesn't really mean Poser is out of memory in Poser 4. It's the message that Poser 4 displays whenever anything is wrong. Usually, it has nothing to do with memory. Usually, if you unzip a product to your Poser folder, all the files will land where they're supposed to be. (Check "use folder names" if you are using WinZip.) If you still have a problem, try running CorrectReference on it.