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#11
Good, that's just the notice for end of support, not a license expiring.
As Dalchina says in post #5, you could download the ISO for the current version and upgrade manually with an in-place upgrade. And as Dalchina also says, it would be a wise precaution to make a system image before you do so (eg. with Macrium Reflect) just in case you run into problems.
Download Windows 10 ISO File
The in-place upgrade process is described here: Repair Install Windows 10 with an In-place Upgrade
As long as you haven't cleaned up the windows upgrade files or deleted Windows.old you have the option for the next 10 days to go back to your previous system. After 10 days Windows will automatically delete Windows.old.
If you'd like longer to check that all is OK, then you can extend this period up to 60 days, but you must do it before the 10 days is up.
Set Number of Days can Go Back to Previous Version of Windows