Currently, there is no way to update the version. You will have to install the new version and remove the old one.
But we are working on the "upgrade module" which will be launched within this month. With the help of this month, you will be able to update your QloApps version.
But please note: when you will update your QloApps version with the help of an update module any customization done on the system will be lost.
So will have to backup all the customizations before updating the version.