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