Frist, extract the data folder into your main mugen folder. Then, choose one of two options depending on what you're using:

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INSTALL THE FULL MOTIF
=======================

In your data folder, open mugen.cfg in notepad. Near the top should be a line beginning with "motif=".

Depending on your resolution and preference for number of character slots, change that line to the following:

480p with 96 slots
motif = data/AlienSoldier/system_480_08x12.def

480p with 368 slots
motif = data/AlienSoldier/system_480_16x23.def

480p with 1536 slots
motif = data/AlienSoldier/system_480_32x48.def

720p with 90 slots
motif = data/AlienSoldier/system_720_10x09.def

720p with 378 slots
motif = data/AlienSoldier/system_720_21x18.def

720p with 1512 slots
motif = data/AlienSoldier/system_720_42x36.def

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INSTALL ONLY THE LIFEBARS
=========================

Open up your MUGEN's system.def file (it might be in the mugen1 folder, but it may change depending on your motif)

Find [Files], then find the "fight =" line, and change it to the following based on your resolution and lifebar placement:

480p, black background
fight = data/AlienSoldier/as_480b.def

480p, clear background
fight = data/AlienSoldier/as_480c.def

720p, clear background
fight = data/AlienSoldier/as_720.def