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AIO (All-in-One):

A single ISO file containing multiple Windows 8.1 editions, such as Core, Pro, and Enterprise. This allows users to choose their preferred edition during the installation process without needing separate discs.

Select the primary partition and click Avançar.

Copying Files: The system will copy the integrated Update 3 files automatically.

After Reboot:

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Here is the breakdown of what each component of that title means in the context of software distribution: AIO (All-in-One): A single ISO file containing multiple

Solution

: This is normal. Download and install the Windows Update Agent (WUA) update KB3138615 manually. Then run the Windows Update Troubleshooter from Microsoft. Select the primary partition and click Avançar

Windows 8.1 can be aggressive about rebooting. Use gpedit.msc (Pro edition) to navigate to: Computer Configuration > Administrative Templates > Windows Components > Windows Update → "No auto-restart with logged-on users" → Enable.

The installer will automatically detect your system’s capability or let you choose manually.