Yes, upgrading to the newest version of Sticky Password is easy. Simply download the installation package and double click on the icon to begin installing. Sticky Password will automatically import your passwords and Identities to the new version and install the new version while eliminating all unnecessary files from the previous version.
Please note that you will be asked to enter your current Master Password from your earlier version of Sticky Password. (You will be asked to enter your Master Password even in the event that you have chosen "No authorization" as your authorization method in the Settings menu.)