Virtual Null Modem 2.5.9 build 1120
The old version may stop incorrectly with an error in the service mode.
August 31, 2016
Virtual Null Modem 2.5.8 build 831
In some rare cases a program that uses a created virtual COM port(s) may hang. The driver for virtual COM ports should be updated. Therefore re-install the program using the full installation package.