First, you will need to install Google Chrome if you’re not already using this awesome browser. Then you’ll need the “Facebook Invite All Extension“. Finally, visit the VDownloader fan page and click on “Suggest page to friends” link. You will notice that there is now a “Toggle all” button visible:
If you have a lot of friends, this could delay your browser for about a minute. Do not attempt to do anything until all friends are selected (dark blue). As soon as all friends are selected, click ‘Send invitations’ and your work is done!