How to download and setup neow3j
Open terminal and run command
                                            git clone https://github.com/neow3j/neow3j.git
                                        
                                        git clone is used to create a copy or clone of neow3j 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 neow3j https://github.com/neow3j/neow3j/archive/master.zip
Or simply clone neow3j with SSH
                                            [email protected]:neow3j/neow3j.git                                    
                                    If you have some problems with neow3j
You may open issue on neow3j support forum (system) here: https://github.com/neow3j/neow3j/issuesSimilar to neow3j repositories
Here you may see neow3j alternatives and analogs
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