How to download and setup invisible_captcha
Open terminal and run command
                                            git clone https://github.com/markets/invisible_captcha.git
                                        
                                        git clone is used to create a copy or clone of invisible_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 invisible_captcha https://github.com/markets/invisible_captcha/archive/master.zip
Or simply clone invisible_captcha with SSH
                                            [email protected]:markets/invisible_captcha.git                                    
                                    If you have some problems with invisible_captcha
You may open issue on invisible_captcha support forum (system) here: https://github.com/markets/invisible_captcha/issuesSimilar to invisible_captcha repositories
Here you may see invisible_captcha alternatives and analogs
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