Windows 10 Technical Preview is a work in progress, and Microsoft began sending Build 9860 to enthusiasts and developers on Tuesday. The new code’s estimated 7,000 changes include a much-anticipated notifications function, as part of a new Action Center.

Users who’ve already downloaded the Windows 10 Technical Preview may check for new preview builds as part of the “Update and Recovery” option. The download totals between 2GB and 2.74GB, depending on CPU architecture and language, Microsoft said.

After installing, your PC will reboot and begin the provisioning process again, asking you for your Microsoft account. In other words, don’t have anything stored on that PC or partition that you’re not prepared to lose.

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