Microsoft released KB4577586 as an optional update to Windows systems back in October last year. The cryptic codename hides a simple tool that is described simply by Microsoft as an update that will "remove Adobe Flash Player from your Windows machine". Importantly it will only remove Flash installations that were bundled with Windows tools – it won't remove third party or user installs.
Adobe Flash reached its end of life on 1
st January 2021 and the Flash Player itself even has a built-in kill-switch that means it refuses to play content on systems where the date is later than 12
th January 2021. Microsoft, Apple, Google, Mozilla, and Adobe have all acted to remove Flash from products that once used/bundled it, so you won't be able to use it in the modern versions of Edge, Safari, Chrome, or Firefox, for example.