How to download and setup captcha
Open terminal and run command
git clone https://github.com/dchest/captcha.git
git clone is used to create a copy or clone of captcha repositories.
You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with captcha https://github.com/dchest/captcha/archive/master.zip
Or simply clone captcha with SSH
[email protected]:dchest/captcha.git