How to download and setup antlr4-calculator
Open terminal and run command
                                            git clone https://github.com/shmatov/antlr4-calculator.git
                                        
                                        git clone is used to create a copy or clone of antlr4-calculator 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 antlr4-calculator https://github.com/shmatov/antlr4-calculator/archive/master.zip
Or simply clone antlr4-calculator with SSH
                                            [email protected]:shmatov/antlr4-calculator.git                                    
                                    If you have some problems with antlr4-calculator
You may open issue on antlr4-calculator support forum (system) here: https://github.com/shmatov/antlr4-calculator/issuesSimilar to antlr4-calculator repositories
Here you may see antlr4-calculator alternatives and analogs
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