Tectia upgrade only for reason of OS upgrade Win XP to Win 7? heavy cost !

The SSH software has been running good for years, but when time comes to upgrade the OS, we are forced to buy a latest version of the SSH software(TECTIA) paying a bomb. The SSH software can indeed require us to pay a small amount to ensure the support for newer OS, as we do not need any additional heavy weight functionalities, which can bring in new potential vulnerabilities as well.