Microsoft stopped allowing the users to download the release of VS 2013 and its Updates, for encourage the user use latest version.
We can download in here.
Morphx is the Microsoft Dynamics AX development environment, We all the developers are familiar with this development environment. Only SSRS and retails developments are going on Visual studio, whereas Microsift Dynamics AX 2012 R3 CU 13 support Visual Studio as development environment.
Microsoft Dynamics AX and Visual Studio are integrated through Visual Studio Tools. VS Tools is a enables the AOT objects in VS for the development for Microsoft Dynamics AX.
The AOT objects are IDE(Integrated Development Environment) with VS by VS tools.
For more details click here
Visual Studio Tools for AX 2012 R3 : Do Microsoft Dynamics AX 2012 R3 CU13 support Visual Studio 2019?
AX 2012 R3 CU10 or later doesn’t support other than Visual Studio 2013 Update 2 or later.
The latest version of AX 2012 R3 CU13 is not supporting Visual Studio 2015.
Microsoft Visual Studio Team Foundation Server 2017 is now supported with AX 2012 R3 CU 13.