How to download and setup TestbedHDRP
Open terminal and run command
                                            git clone https://github.com/keijiro/TestbedHDRP.git
                                        
                                        git clone is used to create a copy or clone of TestbedHDRP 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 TestbedHDRP https://github.com/keijiro/TestbedHDRP/archive/master.zip
Or simply clone TestbedHDRP with SSH
                                            [email protected]:keijiro/TestbedHDRP.git                                    
                                    If you have some problems with TestbedHDRP
You may open issue on TestbedHDRP support forum (system) here: https://github.com/keijiro/TestbedHDRP/issuesSimilar to TestbedHDRP repositories
Here you may see TestbedHDRP alternatives and analogs
framework herebedragons ScriptableRenderPipeline ShaderGraph Entitas UniRx rant AssetsExtractor UtinyRipper kbengine C-Sharp-Promise NoahGameFrame wrmhl xLua MessagePack-CSharp LeopotamGroupLibraryUnity ml-agents PostProcessing awesome-unity UnityDecompiled tolua ZeroFormatter Arcadia Unity Unity-Script-Collection Steamworks.NET behaviac numix-gtk-theme unity Facepunch.Steamworks