You can always get software updates if the update period from your license hasn't expired. If you wish to extend this period you can get a 25% discount. After the update period expires you will be able to get software updates only if you purchase a new license.
If you don't need the rich text editor's sources and the minified version is okay then you can download the latest version from the download page.
Otherwise you have to sign in and download the sources from your account or from the same download page.