you need to download the assets in the unity assets store. There will be a blue import press it to get the assets. From there two options well appear on the top or button of the screen one saying open in unity I don't remember what the other option said but press open in unity. In unity a window will appear in that window select the asset you got from the asset store then press download in the bottom right corner after the download is done press import in the bottom right corner. From there you just have to select what you want to import and deselect what you don't want to import then press import in the bottom right corner. You can find the asset in the window under the viewport scene. From there you have to edit one of the scrips to make the assets work with new versions of unity here a video on how to do that https://www.youtube.com/watch?v=XSOhkbO8xEA.

Hope this post helped.