The Building and Construction Authority lifted the closure order yesterday.
Australian tourist Michael Joseph McCarthy broke his back and was hospitalised after a ride on Sept 11 last year.
Mr McCarthy was on the zip line but did not slow down as he reached the end of the flying fox line. The force of his fall broke several vertebrae in his back.
The operator has added two "admin lines", which means each zip line will have a dedicated line for individual braking systems. In the previous set-up, all three zip lines shared a common system to stop trolleys zipping down with patrons.
The operator also added a primary braking system to stop the trolley as it reaches the end of the zip line. There is also a secondary braking system to serve as an additional protection should the primary braking system fails. It will take over the job of stopping of the trolley if the primary braking system fails.
The operator has also enhanced the standard operating procedures for despatching ride patrons, maintenance and supervision. Channel NewsAsia