Once you have downloaded the installer, double click it to start the installation.
You will soon see the starting screen:
Here, you can just click Next to get to the next screen:
Here you can change the install directory, if you need to, and then click on next to get to the next screen:
Here, you can change the start menu folder if you wish. When you press Next, the install will start, and it should take a couple of minutes at the most. At the end of it, you should see the end screen:
At this point, the installation is complete, and you can click on Finish to dismiss the dialog.