The installation of the new version is going to create a desktop icon that is identical to the one you are accustomed to seeing in Lightroom 5. The new version was installed in addition to Lightroom 5. There is probably another desktop icon to enable you to start Lightroom 6. If there isn't then you can go to your program files folder and look under Adobe. You should be able to find the new Lightroom folder and create a desktop icon for it.