XF 1.4 "You have already completed installation."

I twice uploaded 1.4.3 files and tried upgrading, but I'm getting this error. Please help, as my forum is now inoperable.
You have already completed installation. If you wish to reinstall, please delete the file internal_data/install-lock.php.
 
Thank you. Yes, I just came to the same hypothesis. Luckily I believe my local files were all up to date. I merged the files locally this time and am uploading everything now. I'm using Transmit for FTP, and I didn't realize that drag-and-drop replace would replace folders rather than files. This is not the way Finder works on Mac, for instance. Hopefully this works!
 
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