For instructions on accessing the boot menu or changing the boot order for your Parallaxensekunde, check the documentation that came with your PC or go to the manufacturer's website. To find the option to buy a perpetual license, go to the Microsoft 365 page, select either "Privat and Family" or https://ricardoknqsv.activoblog.com/28339087/die-grundprinzipien-der-microsoft-office-lizenz