Both of you please step away from the soldering irons LOL.As neither of you have got to a programming state yet there is almost zero chance you need to start to play with DFU.Those types of step are last resort after an errant sketch or corrupted bootloader was pushed to a board.Thanks for helping each other out btw that's the whole idea of forums.I need to catch up on where you are.Bob.
I used the top one, the Windows Installer. But I have been considering wiping the installation and using the zip file to manually install to see if that changes anything. Haven't done it yet though. Thanks for the interest in our problem.
The difference between the Windows Installer and "Windows ZIP file for non admin install" versions is that the installer installs the USB drivers and associates .ino files with the Arduino IDE.I just did a fresh installation of Arduino IDE 1.8.9 Windows Installer version on a fresh installation of Windows 10 and was unable to reproduce the issue with the driver. During the installation, I'm prompted to install the drivers. After doing that, I plug in my Uno and the port shows up, no problem, no error.
By the way, when you say "a fresh installation of Windows 10" do you mean formatting the HD and starting all over again or doing a re-install over the existing installation?
2.0 out of 5 starsWould not recommend.April 15, 2019Color: English Projects BookVerified PurchaseI could not program the included ATmega16u2 IC because the bootloader was never installed onto the chip, making the device basically DOA. I had to purchase another Arduino UNO directly from the Arduino website (one that was correctly pre-programmed) and use that second UNO to program the bootloader onto the first just to make it usable.Don't waste your time buying this product from Amazon resellers and take it from me: buy yours directly from Arduino.ccThe only reason this product did not receive one star is because the rest of the components and instructional booklet arrived in this kit as advertised. Still, the main feature of this product (the Arduino UNO) did not work out of the box as expected and was overall a massive disappointment.