Search for "Motorola CLS series programming cable Amazon" rather than software. A good cable often comes with a mini-CD containing the drivers and, occasionally, a copy of the software.
If you have one working CT250 and several dead ones, you can clone using the cable. You need the software to read the good radio, then save the profile, and write it to the new radios. This still requires the software once. Motorola Ct250 Programming Software Download - Google
Power off the CT250. Connect the programming cable to the radio’s side port (under the rubber flap). Connect USB to computer. Turn the radio on. Search for "Motorola CLS series programming cable Amazon"