Hello
This is what you need to do.
1. Purchase Photopost Pro and install it in a directory say called Photos with vb3 integration.
2. Run the vbGallery to Photopost import script and do all the steps in thoser instructions. Once your satisfied with things and do your clean up you can rename your vbGallery directory to say oldgallery and update the paths and url's in admin of
vb till you want to delete it.
vbAdvanced vBGallery to Photopost Import Script
3. In the Photopost Pro admin update the urls and paths to gallery from photos and hit save. Things will break but dont worry.
4. Edit the config-inc.php and config-int.php files of Photopost and change the photos path name to gallery and save those files.
5. Rename your photos directory to gallery
YOUR DONE