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Hi in the include/commmon.php in line 153, show that.
if ( !isset( $_SERVER[ 'REQUEST_URI' ] ) ) { // Not defined by IIS
only change for this
if ( empty( $_SERVER[ 'REQUEST_URI' ] ) ) { // Not defined by IIS
in the ISS, no set var $_SERVER[ 'REQUEST_URI' ] and not work isset, in this case use empty, remember who empty Returns FALSE if var has a non-empty and non-zero value.
saludos.