Installation for 76X (2015)

export SCRAM_ARCH=slc6_amd64_gcc493
scramv1 project CMSSW CMSSW_7_6_3_patch2
cd CMSSW_7_6_3_patch2/src/
cmsenv
wget -O - --no-check-certificate https://raw.githubusercontent.com/mmusich/2l2v_fwk/ZHllvvAnalysis_2015/TAGS.txt | sh

Now, ONLY after the code has finished to compile insert inside UserCode/llvv_fwk/BuildFile.xml

<use name="ZZMatrixElement/MELA"/>
scram b -j 12  

#Step to use MELA

cd CMSS_X_Y_Z/src
git clone https://github.com/cms-analysis/HiggsAnalysis-ZZMatrixElement.git ZZMatrixElement
cd ZZMatrixElement
sh setup.sh -j 12