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No worries, the structure and location of the game's files hasn't changed, so your profiles and worlds are still usable. Additionally, all previously created profiles and their configurations will be present. Right away, you may notice that the launcher starts up quicker - this is due to bypassing Java on startup. As soon as it is done, the launcher will open. If the shortcut is clicked or double-clicked (depending on your settings), or if the user selects "Run Minecraft" in the installer once it has finished, a program will open and download the Minecraft launcher itself along with a few other components. This defaults to "C:\Program Files" for 32-bit versions of Windows and "C:\Program Files (x86)" for 64-bit versions. When the installer is run, the launcher is downloaded to your Program Files directory and a shortcut is created on the Desktop.
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