The latest Virtual COM port drivers for the USB serial converters for all operating systems can be found here: https://www.ftdichip.com/Drivers/VCP.htm
The VCP drivers must be kept up-to-date on all computers. This is the only way to guarantee clean and correct communication with the K2 software. For installations on Apple OS, please make sure that full access rights are available. Otherwise a driver installation and subsequent use will fail.
Various installation instructions can be downloaded here: https://www.ftdichip.com/Support/Documents/InstallGuides.htm.
The chip manufacturer FTDI has been maintaining the Virtual COM port drivers for over 20 years and supports millions of users reliably. As soon as updates of the operating systems of Windows and Apple are available, FTDI reacts with appropriate adaptations.