Microsoft: All apps must be re-installed for preview-to-RTM Windows 8.1 upgrade June 5, 2013 by admin Tweet Microsoft has offered up more information on exactly how owners of Windows 8 PCs will be able to upgrade to the free Windows 8.1 OS, including if they will have to reinstall their Windows 8 apps. Read more… Neowin Related Posts:You can upgrade from a debloated Windows 10 to…Microsoft's new ad explains why you should upgrade…People on unsupported hardware are being offered…How to reinstall Windows 11 without losing your data…Here is how you can upgrade to Windows 11 22H2 right now