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