Please make sure that the Windows OS and development tool you are using are supported,
and then upgrade the version.
For the supported OS and development tool, please refer to the driver specification table of each device driver.
Current version: https://www.contec.com/download/list/driver-software/comdvr/
Even if the version of Windows OS or development tool you are using is not supported,
you can download the old version from CONTEC website.
We always recommend using the current version, but please use the old version as necessary.
- COM-DRV(W32) for PCI bus boards, PCI Express bus boards
https://www.contec.com/download/list/driver-software/comdvr_old/#pci
- Windows COM Driver for USB [COM-1xx(USB)H] for USB micro converters
https://www.contec.com/download/list/driver-software/comdvr_old/#usbm
- Driver for USB compatible serial communication unit COM-4xx-USB for USB units
https://www.contec.com/download/list/driver-software/comdvr_old/#usbu