1>first download both files at http://q43a.org/

2>place the Q4_Militia_1.7_rCon_1.1.13.zip into the main quake 4 directory and rightclick it and choose extract here from your archive app plugin

3> then place the militia_1.1.15_beta_7.zip in the new militia_1.7_1.1.13 directory that is in you main quake 4 directory, rightclick it and choose extract here from your archive app plugin, and click yes to overwrite all existing files

4>go back into the main quake 4 directory and run the run_militia_1.7_1.1.13.bat to automatically load q4 militia with no startup videos, or run quake 4 normally and goto the mod menu in the bottom left corner of the main menu and load the mod from there