[TiKu]

To fix the problem, add this code to MN hook:

			if (!function_exists('vsa_CompareVersions'))
			{
				function vsa_CompareVersions($verstr1, $verstr2)
				{
					$ver1 = explode('.', $verstr1);
					$ver2 = explode('.', $verstr2);
					for($i = 0; $i < 3; $i++)
					{
						if(intval($ver1[$i]) > intval($ver2[$i]))
							return -1;
						elseif(intval($ver1[$i]) < intval($ver2[$i]))
							return 1;
					}
					return 0;
				}
			}

Then instead of

if ($vbulletin->options['templateversion'] >= '4.1.8')

use this code:

$templateVerIsOlderThan418 = (vsa_CompareVersions($vbulletin->options['templateversion'], '4.1.8') > 0);
if(!$templateVerIsOlderThan418)