If you're behind a proxy and want to use Zeplin's Photoshop plugin, open a text editor and enter the following lines as necessary:
HTTP_PROXY=http://your proxy address
PROXY_USER=your username (This line is optional.)
PROXY_PASS=your password (This line is optional.)
Name the file
plugin.env and save it to
<Your Photoshop folder>\Plug-ins\Generator\io.zeplin.photoshop-plugin then restart Photoshop.