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