rocketcsman

So I downloaded ksp about a year ago, but I got it on the ksp website. In the download folder there is a notebook titled "READ ME". It said that on windows mode, you get the ksplauncher.exe out. I cannot find it. Can someone show me where it is please? Also, on the page where it says current version, and most recent version, there is an update button but I cannot click it. So can someone please show me how to update the simulator?