Although there would be problems arising from installing version 4.7 instended for Zen cart 1.3.8 onto your 1.3.7 cart, from the symptoms that you describe, it sounds more like you have an incomplete installation.
Seen a few of these recently, where FTP programs appear to have copied all of the files across, but in practise haven't overwitten existing files.
The good news is that since the only changes for 1.3.8 were to files that were also in 1.3.7 and the were no database changes, you don't need to uninstall, you can simply copy the files from version 4.6 onto your site. But do check that they arrive safely by checking your FTP programs error log and the dates modified on your server.
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