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As is now general knowledge there is only a year of support for Windows 10 left so when doing updates and chance to update to Windows 11 again was shown I took it, around two hours later the install had downloaded and then 'Working on Updates' started.
As with normal updates you get a reboot at 30% and the next here was 75% - with a long delay at 90% - and then you are done after around another hour. So in my case with a not that new notebook its an Intel i5 processor, 8GB RAM a small SSD drive and a 1TB 'D' drive, together suitable to run Windows 11.
This is a much later – and more friendly – version of Windows 11 than what was first delivered a few years ago.
First thing after the update you now have to input your password, even if you normally use a PIN, finger print or other method you will still need to input your password so don't start unless you know it. Assuming you use a PIN it no longer automatically offers the chance to input a PIN you have to go to Settings which is in a blue square on the tray at the base of the screen then enter PIN and follow the instructions and you will then be able to enter the PIN to start next time rather use your password. You will also need to do this after each update.
Another thing that is different from Windows 10 is that shut down or restart is still on the blue square but it will not be in the left bottom corner of the screen but further along the tray at base of the screen.
Remember that you will only be given the option to upgrade if Windows thinks your machine can handle it. Something at no cost from Microsoft.