Portable version is used to carry Notezilla on a pen drive/usb drive so that you can plug it in to any computer and use Notezilla . It does not come with an installer. It is just a .zip file. Uncompress anywhere and run Notezilla . Some users prefer to use it on their desktop also whenever they don't have administrative privileges to install any software. The Windows sticky notes data is stored along with the portable version itself under a sub-folder called "Data".
You can download the portable version from here : www.conceptworld.com/Notezilla/Portable