[Thunderbird8]

This particular error can be easily fixed by finding "function path" in functions_vbseo_pre.php and putting "static" at the beginning of the line (maybe public static, though public is implied if public/private designation is not present). At least that's what I did. I think that's the only 5.4 error that vBSEO has (now if you upgrade to 5.5, there's a ton more because of the preg_replace /e deprecation, so you might want to avoid that version for now).

Also, if you're going to be using PHP 5.4, you should probably upgrade vB itself to 4.2.2, as previous versions spit out a lot of errors similar to what you posted.