https://www.bleepingcomputer.com/news/microsoft/microsoft-old-windows-updates-now-expire-to-improve-speed-security/ > Microsoft says it regularly evaluates Windows updates for expiration to make the entire update process faster and safer by removing older releases that have already been superseded by newer packages. > Installing updates is slower and their size gets incrementally bigger due to the long backlog caused by the two or more updates for each Windows platform released every month.