dpinst fails to install driver silently

Question

I use Inno Setup installer to install my Win32 application, it is installed mainly on Windows 10. There is a driver for some USB dongle (basically it is USB serial port) to be installed together with my app. The driver consists of files and directories:

amd64 (folder)
x86 (folder)
dfu.cat
dfu.inf
usbserial.cat
usbserial.inf

I added dpinst32.exe and dpinst64.exe to the driver's folder and I call dpinst32 or dpinst64 (based on Windows version) from my installer.

However, on some PCs I end with drivers not installed.

What is the correct way to install drivers by my installer?

EDIT: This is log from dpinst64.exe /Q /c

INFO:   Option set: dumping log info to console.
INFO:   Current working directory: 'F:\windrv'
INFO:   Running on path 'F:\windrv'
INFO:   No valid 'dpinst.xml' file provided.
INFO:   Install option set: Running in quiet mode. Suppressing Wizard and OS popups.
INFO:   Found driver package: 'F:\windrv\dfu.inf'.
INFO:   Found driver package: 'F:\windrv\usbserial.inf'.
INFO:   Preinstalling 'f:\windrv\dfu.inf' ...
INFO:   ENTER:  DriverPackagePreinstallW
INFO:   RETURN: DriverPackagePreinstallW  (0xE0000242)
INFO:   Preinstalling 'f:\windrv\usbserial.inf' ...
INFO:   ENTER:  DriverPackagePreinstallW
INFO:   RETURN: DriverPackagePreinstallW  (0xE0000242)
INFO:   Returning with code 0x80020000

Answer 1

The /S Option of Dpinst completely hides all interaction with the operating System. The Problem you are having is that your operating System does not trust the manufacturer yet and does not complete the Installation. If you run Dpinst with the Parameter /SW for example you will see this window.

That will be the reason why the Installation works on some Computers and on some other not.

One solution is to extract the certificates for your Drivers, call certmgr.msc from the console and check under "Trusted Publishers", you should find the manufacturer and with a Right click be able to export the certificate as a yourCert.cer file. You can then as Admin call certutil.exe -addstore "TrustedPublisher" yourCert.cer from the console before you call Dpinst /S on your target system.

As you already gave the operating System the certificate the window should not Pop up anymore and you can run dpinst completely silent.