Google Web Designer isn't yet available in Google's official repository so you won't get automatic updates like you get with other Google products for Linux, like Google Chrome. So for now, you must check when a new version Google Web Designer is released and manually download and install it.
How to install Google Web Designer on Linux Mint or Ubuntu or Debian or Fedora
and then run this command to install it
sudo dpkg -i google-webdesigner_current_i386.debNote some case Google Web Designer doesn't work on non-English systems. If that's the case for you, Try it
remove its folder under ~/.local/share/:
rm -r ~/.local/share/google-web-designer
And then start Google Web Designer using the following command: