Campbell Scientific COM320 Voice Communications Modem - Manual (Page 37)

Appendix B. Updating and Configuring the COM320
6) In the next dialog, you will need to specify the location where the
downloaded driver file was stored. In the example shown, the driver was
stored in the c:\download directory.
7) You will get a warning from the operating system indicating that the
driver is "unsigned". In order to continue with installation, you need to
select the Continue Anyway button.
B-3