屏蔽“您目前使用的Discuz!程序有新版本发布,请及时升级！”提示

在/discuz/source/admincp目录下找到文件：admincp_main.php

找到第49行：

if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !$shownotice && $_G['setting']['upgrade']) {
	$shownotice = '<div class="notice"><a href="'.$basescript.'?action=upgrade" id="notice">'.$lang['upgrade_right_now'].'</a></div>';
}
if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !isset($_G['cookie']['checkupgrade'])) {
	$discuz_upgrade = new discuz_upgrade();
	if($discuz_upgrade->check_upgrade()) {
		if(empty($shownotice)) {
			$shownotice = '<div class="notice"><a href="'.$basescript.'?action=upgrade" id="notice">'.$lang['upgrade_right_now'].'</a></div>';
		}
	}
	dsetcookie('checkupgrade', 1, 7200);
}

把这一段注释掉即可。