I don't have a manual but installation is usually done by stacking the
door panel on top of each other (as if the door is closed). Support
them in place with nails or screws on both left and right ends
securely as you go up. Once the door panels are in place, then
assemble the vertical tracks on both sides. Once in place, assemble
the hinges and wheels into the tracks. Now that you are to this
point, the door should be fully self supporting within the tracks.
Next assemble the curved and horizontal tracks and support them. You
are now done except for the spring assembly and it's very very tricky
and dangerous if done wrong. You may want to call a professional to
do the spring part. That is about all I know. Good luk