Which Modicon family do you have? There is a ProWORX 32 lite version available that will only work with the smaller PLCs (Compact, Momentum, and Modicon Micro) for a fraction of the full price.
If you just need for upload/download, printing, and register access you can use the demo version for free. The demo version has all capabilities of the full version, except you can only view/edit the first 25 networks of the program.