It sounds as if you are using the Lightroom 5 version from the creative cloud, and you don't have a subscription. The Lightroom behavior you are describing is what happens when you don't have an active creative cloud subscription. Upgrading catalogs from Lightroom 4 to Lightroom 5 does not do anything to the original catalog if you can find and start Lightroom 4, you should be able to start right where you left off. But any new files that you imported into Lightroom 5 will not be there. They will be on your hard drive and you can import them again. But you are going back to a catalog that was used up until you installed Lightroom 5. Hopefully, you didn't uninstall Lightroom 4.
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