>>Hi everybody,
>>
>>After installing SQL Server 2012 (BTW, the installation was relatively quick and absolutely painful), I want to install SP1 now.
>>
>>So, I see this page
>>
>>http://www.microsoft.com/en-us/download/details.aspx?id=35575
>>
>>and I don't know which file I need to download for Windows 7 64 bit and SQL Server 64 bit?
>>
>>Thanks in advance.
>
>
>What I did was pull down the ISO file (but that's just me)

I should have probably ask David Browne from MS the original question :)

Here is his reply:

---------------------------
We now ship full slipstreamed installs of service packs, meaning that it’s a full install of the product, with the service pack installed.

So

SQLServer2012SP1-FullSlipstream-ENU-x64.iso

Is a full install, not a service pack installer.

The service pack installer package to upgrade a 2012 RTM istance to SP1 is

SQLServer2012SP1-KB2674319-x64-ENU.exe

David
--------------------
which means I downloaded this file for nothing :) and now should go back, download the exe and run it.