Once you have opened up the rar file, you will find the CentralComposers Folder inside. You can either drag this folder to a Folder where your DAW looks for the VST Plugins or you can copy the folder inside called Central Guitar VST’ to a plugin folder. After, in your DAW, bring up your VST instruments and you will find Central Guitar.
If you need WiN64 VST use jBridge
If you need RTAS use FXPansion.VST.to.RTAS.Adapter