How to download and setup cartogram3
Open terminal and run command
                                            git clone https://github.com/austromorph/cartogram3.git
                                        
                                        git clone is used to create a copy or clone of cartogram3 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 cartogram3 https://github.com/austromorph/cartogram3/archive/master.zip
Or simply clone cartogram3 with SSH
                                            [email protected]:austromorph/cartogram3.git                                    
                                    If you have some problems with cartogram3
You may open issue on cartogram3 support forum (system) here: https://github.com/austromorph/cartogram3/issuesSimilar to cartogram3 repositories
Here you may see cartogram3 alternatives and analogs
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