Autodesk no longer offers AutoCAD MEP 2014 trials, but you can access free 30-day trial from Autodesk's official website.
Autodesk provides for all its software, including AutoCAD MEP (now integrated into AutoCAD with MEP toolset), to students and educators. You simply need a valid school email address (.edu). Renew as long as you are enrolled. X-force AutoCAD MEP 2014 Download
If you're a student or educator, Autodesk provides for all software. Autodesk no longer offers AutoCAD MEP 2014 trials,