I'm sure there's a guide on here.
But from memory, loosen the bolts on the lower inside hinge. Use a jack and something between the jack and door to lift the door and retighten.
Dropped? There's 2 bolts for adjustment on the inside. Mines dropped so badly I need to fabricate a spacer to sit between the hinge and door to push it up.
I didn't pay. Was just part of my package. I know when I'd researched it before people were quoting me up to 150. Unlikely SC charges anywhere near that
Ratios are slightly different in all the boxes with the box from the 200 having slightly better. If you do a thread search there's a thread that has each box with every ratio in it.