If you can't open install in browser because of missing files, look in library/XenForo/Application.php on one of first lines:
* Current printable and encoded versions. These are used for visual output
* and installation/upgrading.
* @var string
* @var integer
public static $version = '1.5.12';
public static $versionId = 1051270; // abbccde = a.b.c d (alpha: 1, beta: 3, RC: 5, stable: 7, PL: 9) e