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SCOMM32.OCX fixed my issue with my old but functioning VB6 app - it now works flawlessly under Win10. This means I can delay a little longer the needed but time-expensive upgrade to .net. I point out that my app was developed when VB6 was the state-of-the-art and it has not needed much in the...

I will not grace your post with a reply. :-|

Paul, many thanks for the prompt reply and the background to the problem. I don't think I am using a very old copy of serial_install.exe on my Win10 machine, but will check. Are there alternatives to USBSER.SYS? If the problem is with USBSER.SYS does it mean that using an alternative to MSCOMM32...

I do a standard installation and MSCOMM32 is standard for VB6 to access the VCP driver - presumably that is usbser.sys because the Teensy serial_install.exe is executed by my installation software. Do you use VB6?

This post concerns serial communications with a Teensy 3.2 under Windows 10 - Teensy code is therefore not relevant and hence not provided. Using VB6 and MSCOMM32.OCX to access Teensy 3.2 works well for me under Windows 7 and 8.x. However, under Windows 10 I get an 8020 device not available...