Hi Dear Customer, We see you already got the issue solved through github. We also updated the wiki and we tested it with rpi zero w with kernel 4.14.30 successfully.
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.14.30+ #1102 Mon Mar 26 16:20:05 BST 2018 armv6l GNU/Linux
pi@raspberrypi:~ $
Here are the instructions for the driver installation.
sudo apt-get update
sudo apt-get upgrade
git clone https://github.com/respeaker/seeed-voicecard.git
cd seeed-voicecard
sudo ./install.sh
reboot
thanks
Seeed Techsupport Team