Can't set up the installation

On a Mac 10.10. Dowloaded the latest version of MAMP. Uploaded the gibbon files under MAMP in htdocs. Started MAMP and went to localhost:8888/gibbon/installer/install.php and nothing appeared but the gibbon logo and a beautiful picture of a mountain range. Any tips about what I’m doing wrong? Thanks.

Hello. This is a duplicate of a previous post you made. Please try and post only once, and then wait for a reply. We generally try and respond within 24 hours. Ross