Installer returns 256 after successful installation process. Running in cmd to check:
start /wait ./InstallDriver.exe
echo %errorlevel%
This cause problems with processing the installation process results in other installers (including this driver installer). Checked on Windows 10, Version 2004, Build 19041.388
Diff:
Please use mailing list to discuss further libusb-win32 issues.
And the installer is no longer supported. You can use Zadig or the installer from libusbk.
You can also submit tickets through github.
https://github.com/mcuee/libusb-win32