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