After installation Quicken 2003 nags you to register each time you launch it (see Figure 1), but if you click “Register Now”, it gives you an error (see Figure 2).
While holding down the CTRL & SHIFT keys on your keyboard, select the “Online” menu and click on “One Step Update” (see Figure 3). You’ll get a message saying “You will no longer be prompted for registration” (see Figure 4).
This procedure probably works on other versions of Quicken. If you’ve tried it on another versions and can verify that it works, please let us know so we can update this post.