See my reply above. If I copy & paste the entire sub-directory, wouldn't I lose the files that aren't included in the patch (because, I assume, they're not meant to be replaced)?
By the way, I didn't exactly copy files one at a time. I copied entire sets of files from each patch sub-directory to the corresponding installed sub-directory. I'm not a TOTAL noob.
The patch is a self-extracting archive file published by the RTR group. It appears to utilize the StuffIt compression utility. I need additional extraction software to install?