When Windows 10 was first released, users had 30 days to "roll back" any new version of Windows. After the release of the Anniversary Edition, Microsoft changed the number of rollback days to 10. Here's how to increase or decrease the number of days you can roll back a Windows feature upgrade.
Windows 10 keeps the files of the current installation when a feature upgrade rolls out, so you can "roll back" the upgrade if you need to.
The current roll back period is 10 days. That may not be enough time to discover any bugs, incompatibilities, or new features that you may not want. You might decide to stick with the current version for a while. You might want to limit the amount of days for a roll back.
If you've upgraded from a previous version of Windows (Windows 7 or 8.1) you may want some extra time to discover how Windows 10 works and decide if you want to keep it or not. This article at Ghacks explains how to change the roll back day period.
Feature upgrades are version number upgrades, not the smaller Windows Update patches and fixes that are released every month. Feature upgrades have traditionally been named (Anniversary Update, Fall Creators Update, Spring Creators Update) that have a version number change and are the only versions that can be rolled back.
Note that there have been issues with some Windows 10 roll backs not working well or not working, so a backup of your hard drive or your important files and folders is always a good idea before an upgrade. See our articles for back up recommendations: Best Free Drive Cloning Software and Best Free File-Based Backup Program.
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