Good to hear
That's what I did but I am still getting the error
The easiest way, if you don't want to run the installer in the root dir of the ISO, is to update the driver via the Device Manager, select "Browse my computer", point it to the CD and enable the "Include Subfolders" checkbox.
I am going to do this part will leave a post if it woks!
Don't forget to install the Ballooning Agent (needed to provide memory usage infos from within the VM, even if you don't use memory ballooning) and the Qemu Guest agent. As I assume those devices are the Serial interface for the guest agent and the ballooning device.