This is a special version of The Vinewood Car Club mod that works with the licensed version of GTA 5 Enhanced. However, it allows you to sync directly with the Vinewood Garage from GTA Online and always have the most up-to-date list of premium cars in Story Mode.
The mod does not write any data to multiplayer, so it is completely safe for gameplay and is not considered cheat software. It simply reads global variables from the Vinewood Garage script, which are updated via tunables when the game loads.
If you don't have a licensed copy of GTA 5, you can install The Vinewood Club Live, but the cars in the garage won't be updated. The same applies if offline mode is enabled in the launcher, or if you're playing without an internet connection.
For Legacy, It is recommended to use the original Vinewood Club mod. It will soon receive bug fixes that have already been implemented in the Live version.