=============================================
web/install/mod/setup/CFend_setup.class.php

--------------------------------------------
	public function hd_BodyHeader( $prt ) {
		$lca_ai = CEnv::locale("app.info");
		$lca_inst = CEnv::locale("install");
		$title = $lca_ai[ 'app:name' ] . ' ' .
			'<span style="font-size:80%;">' . $lca_ai[ 'app:version' ] . '</span> ' .
			 $lca_inst[ "installation" ];
?>
<header>
<div class='title'><?php echo $title; ?></div>
Free Trial Version <================================== ADD STRING!
</header>
<?php }

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web/admin/mod/auth/tpl.login.inc.php

--------------------------------------------
	<div class="panel-footer">
		<div class="form-group">
			<button class="btn btn-success btn-lg btn-block btn-login"
				type="submit"><b><?php echo $lca[ 'label:enter' ]; ?></b>
				<span class="glyphicon glyphicon-play" style='font-size:80%;'></span>
			</button>
		</div>
		<div style="color:red;">Free Trial Version</div> <============ Add Line
	</div>
=============================================
Zip it as 

SUMCX-211-free-trial-version.zip

=============================================