Note there is NO Upgrade for 1.8.0 or 1.8.1 - reason - things (features, settings, configurations) are too different when you hit a major release on Apache and/or PHP. XAMPP 1.8.0/1 has Apache 2.4.x, prior XAMPP releases were 2.2 - big changes. The same for PHP, 1.8.0/1` has PHP 5.4.x -- XAMPP 1.7.7 was PHP 5.3.8 -- big changes, particularly in Error Reporting -