The first thing we are going to do is to download and install Unity Hub from here. Unity Hub is a desktop application that acts like an entry point for all Unity-related matters on your machine (projects, installed versions of the engine, licenses, etc.). It is much more convenient than manually handling all the different versions of the engine that may be installed on your machine at any point in time and will be, in fact, the only supported way to launch the engine starting with Unity 2019.
Once you have downloaded and installed Unity Hub, create a new, empty project using the latest version of Unity 2019.2.0.
Choose a descriptive name for your project and select the 2D template.
The next step is to add the Entities package via the Package Manager (make sure to select the Show preview packages option in the Advanced menu).
Finally, download the free DOTween asset from the Asset Store and import it into your project. Make sure you perform the additional setup step that DOTween requires by selecting the Setup DOTween option in the Tools/Demigiant/DOTween Utility Panel menu.
We will use DOTween for all the animations in our game.
With our project correctly set up (you should have no errors in the console at this point), we are ready to go!