Answer: Uninstall your Minecraft client. Run the Minecraft Launcher and log into your account. Click the “Manage Installs” button in the bottom-right corner of the window. Locate the installation you wish to delete and click the “Uninstall” button. Confirm that you wish to uninstall the installation by clicking “Yes.” The uninstalled installation will be removed from the list. If you reinstall Minecraft, this installation will not be available for download.