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