I have transferred my files from my old computer with LR4 to an external HD. On my new computer I have installed LR5. I can find the files but I cannot get the Keywords. How do I import the keywords?
You need to upgrade your LR4 catalog file to a LR5 catalog. This is done via opening LR5 and then selecting File->Open Catalog and pointing to your LR4 catalog file.
More details are here: How do I move Lightroom to a new computer? | The Lightroom Queen