Sometimes Windows Server 2012 will not let pre-requisite installer install

When server 2012 will not allow pre-requisite to run, due to the ASP.NET 3.5 or 4.5, do this:

Run, from admin command prompt:

Dism /online /enable-feature /featurename:NetFx3 /All /Source:<drive>:\sources\sxs /LimitAccess

Note In this command, <drive> is a placeholder for the drive letter for the DVD drive or for the Windows Server installation media. For example, you run the following command:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess

Then you should be good to install the pre-requisites; but if 4.5 still barks at you, you can install it with:

DISM /Online /Enable-Feature /FeatureName:NetFx4 /All  /Source:d:\sources\sxs /LimitAccess

or via gui,

make sure you have the windows media mounted into your DVD drive on D:\ else modify the commands to your DVD drive designation

Here is a KB on the subject,

.NET 3.5 :

 use the DISM command or the powershell, either will work the magic

.NET 4.5: , same advice use dism or powershell

After the .NET framework is in play, you can then run the SharePoint pre-requisite installer, several restarts will occur.

Here’s a good technet on the procedure for machines that do not have internet connectivity:

This is a really good blog post about the .NET framework, installing it, etc.

scroll down to the section that starts. . . .”

Administrators can also use Deployment Image Servicing and Management (DISM) or Powershell cmdlets to enable the feature. DISM can be used to install the feature on individual computers, or to install it on an image that will be deployed to multiple computers.

Here are some sample DISM commands to enable and get the status of the .Net Framework 3.5 feature:

Dism /online /get-featureinfo /featurename:NetFx3

Dism /online /enable-feature /featurename:NetFx3 /All

DISM reference

But what if you’re still getting an error about the Server having .NET 4.6?

Download the appropriate file for your environment and save it into the updates folder of your install media.

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