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