Were you cloning a psp bubble that was already on the vita?
The app downloads your original bubble automatically, then downloads/modifies your app.db file.
Then it automatically uploads the clone bubble and the modified app.db file.
The bkpapp.db file is placed in the root directory of the script (on your pc, not the vita).
After the process, you should just reboot your vita and a new bubble will be on the last page of your homescreen.
If the bkpapp.db file is missing, something must have gone wrong during the script.
Did it take a while to download/upload the bubbles (depending on your internet connection and the base bubble size, 5mins+)?
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I think I figured out why It seemed to work without making a bubble or installing VHBL. I am on windows 7 and using filezilla. I see error screens scroll by real fast when I do the installer. You can do FTP without filezilla on new versions of windows. So should I use one of the old versions?