SharePoint 2016 – Office Online Server – Error : This product requires Microsoft .Net framework 4.5

I am installing SharePoint 2016 together with PowerPivot and Power View for SQL Server 2016 and I have a 3 servers Hyper-V environment running locally:

A domain controller (with a tabular instance of SSAS 2014)
A SharePoint 2016 single server farm
A SQL Server 2016 CTP 3.1 running the database engine and the tabular instance

I am following the installation described on this great whitepaper : http://go.microsoft.com/fwlink/?LinkId=717341

And everything is going great. The only thing is I want to keep my server number down to 3 instead of 4 as the whitepaper describes. This for resources reasons. So I decided to run Office Online server Preview on server 3 (The SQL Server 2016 CTp 3.1 box) as it can not run on the same box than SharePoint – clever licensing gimmick !!

The problem is that I get an error when installing Office Online Preview : This product requires microsoft .Net framework 4.5

But .Net Framework 4.5.2 is installed and running on the server.

the problem occurs because SQL Server 2016 CTP 3.1 ships with the .Net framework 4.6 and the Office Online Server Preview Setup program does not recognize the .NET Framework 4.6 as a supported version of the .NET Framework.

There are several ways around this problem, the easiest one making sure that the .NET Framework 4.6 is not installed when you run SharePoint Setup.
If the Microsoft .NET Framework 4.6 is already installed, follow these steps

Making the server believe that you have changed the .Net Framework version

Change the following values from “4.6.00057” to “4.5.50501” in

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\Version
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\NET Framework Setup\NDP\v4\Full\Version