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