How to download and setup detectron2
Open terminal and run command
                                            git clone https://github.com/conansherry/detectron2.git
                                        
                                        git clone is used to create a copy or clone of detectron2 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 detectron2 https://github.com/conansherry/detectron2/archive/master.zip
Or simply clone detectron2 with SSH
                                            [email protected]:conansherry/detectron2.git                                    
                                    If you have some problems with detectron2
You may open issue on detectron2 support forum (system) here: https://github.com/conansherry/detectron2/issuesSimilar to detectron2 repositories
Here you may see detectron2 alternatives and analogs
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