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