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