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