Monopoly Plus is the official main Monopoly game that you can play on PC. If you want the best technical support and options for playing online multiplayer against others from around the world, it would be best to buy the official Monopoly game. They also don’t have the official rules and property names, so it depends on what matters most to you. There are some unofficial Monopoly versions for free, but they don’t have the same features and they’re a lot simpler. It does usually cost less than buying the physical board game though.
It generally costs between $15 and $20 but can sometimes be more. To download and play the official Monopoly for PC game you’ll need to pay for it. You can also find a load of unofficial options on the Microsoft store if you just want the same gameplay experience without all the official property names or licensing. The official game is called Monopoly Plus and can be bought either directly from the Ubisoft store or from the Steam or Epic Games stores.