How to download and setup doc-gen
Open terminal and run command
                                            git clone https://github.com/TypeAware/doc-gen.git
                                        
                                        git clone is used to create a copy or clone of doc-gen 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 doc-gen https://github.com/TypeAware/doc-gen/archive/master.zip
Or simply clone doc-gen with SSH
                                            [email protected]:TypeAware/doc-gen.git                                    
                                    If you have some problems with doc-gen
You may open issue on doc-gen support forum (system) here: https://github.com/TypeAware/doc-gen/issuesSimilar to doc-gen repositories
Here you may see doc-gen alternatives and analogs
NelmioApiDocBundle Statiq.Web graphql-voyager slate zeal yii2-apidoc devdocs raml-spec redoc docfx awesome-api-devtools flasgger json-schema-spec Robinhood CHN-EOLINKER-AMS-Lite-4.0-For-PHP rest-layer jsdoc-to-markdown rest-client nei-toolkit alfred-devdocs eoLinker-API-Management-2.X-for-PHP japicmp create-openapi-repo CHN-EOLINKER-AMS-Lite-4.0-For-Java documentation-starter angular-swagger-ui hexo-theme-doc multicolour pretty-swag drf-autodocs