Downloading a new version of the blue voda website builder will not cause you to lose the pages exisiting already on your computer.
As you build pages in the blue voda website builder, those pages are stored on your computer in MyDocuments/Blue Voda ... they are .bvp files - do a search on your computer for .bvp files
If you find the .bvp files and the images no longer appear, it means that you have moved the images from the path where you inserted them .. to see these images on your .bvp files, you will need to reinsert them again, and will need to do so if you make changes to your page and wish to republish those pages.
You must use the publish page to publish your pages - not blue ftp ...
If you do not have the .bvp files on your computer any longer, you can import these pages to your computer by using the import method ...
Open up your webbuilder and Choose "Open a New Blank Page" then go to File and choose "New from Existing Html Page" then type in the full url of the page you are importing
http://www.nameofyourdomain.com and tick "Remote" and the page will import for you ... there are some modifications that you will have to make here though ...
It is best to go into control panel, "File Manager" and into the folder that contains your website (public_html for your main domain) to find all of the pages that you have built - this is where you will find them all ... sometimes they do not all show up in ftp
For the pages you wish to make changes on, you will need to reinsert these images and elements and republish again - the others you can do when you have time ...