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