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