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