Drill 3 16 inch holes tap plastic wall anchors in and attached the jamb with screws sliding the door into place.
How to install a sliding shower door on a tub.
How to install a basic sliding tub shower door.
Check out this interesting option http amzn to 2f3zkq7 another one http amzn to 2www3cf some of the mistakes to avoid would be.
Hanging the door panels.
Place the rollers on the top frame flange of both door panels and secure them with lock washers and machine screws.
Fit a plastic separator clip over each hole then slide the metal hanging brackets over the separators.
Identify the 2 mounting holes on either side of the upper edge of both panels.
Mark the positions of the screw holes and use an automatic pump to create divots.
Prepare the doors by installing roller and if applicable handle towel bar hardware.
Sliding doors hang from the top track so install it over the wall jambs as directed by the manufacturer.
How to install a basic sliding tub shower door.
Attach hanger brackets to the tops of the door panels.