Windows 10 quietly enters the official version with installation steps

Windows 10 will be officially released on July 29, and before that, Microsoft must lock the RTM official version in advance, so the rest of the time is not enough for a month.
Microsoft has said before that it will release at least one preview version publicly. It is not known when it will arrive, but the Build 10147 leaked last night has already had a formal version.

At the time of installation, the first version is available, including the home version, the professional version, and the previous default version.
Select the home version, you can continue to upgrade to the professional version or the enterprise version after installation. If you choose the enterprise version, you can upgrade to the enterprise version.

There is then a step to enter the secret key, which was previously activated automatically. Of course, you can skip this step (Skip), but the system is inactive after the installation is complete.

If you don't activate, many features will be restricted, such as theme, icon, sound and other personalization settings.

After the installation is complete, you can upgrade the version and enter the corresponding new key.

However, the keys of Windows 8, 8.1 are not available.