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