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