Impossible to download and install Sierra

Hello!

I have a MacBook Pro (15-inch, mid 2009 / 3.06 GHz Intel Core 2 Duo / 8 GB 1067 MHz DDR3 / /NVIDIA GeForce 9400 M 256 MB SSD) with the installation of OsX El Capitan (10.11.6 (15 G 1004)). I can not download and install the Sierra of AppStore because he says: "this version of macOS 10.12 cannot be installed on this computer."

I read the list of requirements and my machine is in there.

Is this a bug? Can someone explain the reason why this is happening?

Thanks in advance!

MacOS Sierra technical specification:

https://support.Apple.com/kb/sp742?locale=en_AU & viewlocale = en_US

Tags: Mac OS & System Software

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