Think I've found a bug in file: gas3_install.php
Line 2952:
PHP Code:
if (!is_dir("/$folderchanges[root]")){
doesn't work ... the variable $folderchanges[root] is undefined and the slash in front tries to check from the file system root rather than from the current directory.
I changed it to:
PHP Code:
if (!is_dir("$folderstructure[root]")){
... and it then worked.