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