There are two options depending on your budget.
How to repair awning fabric.
Do not remove the stitches.
Roll the fabric up and reattach the legs before you put the awning back onto the rv.
Fabric awning repair can take on many forms from repairing holes and rips to replacing the entire mechanism of the awning.
The absolute best option is made by eternabond.
There is nothing wrong with the stitches already on the awning so there is no reason to remove them.
Insert the new awning into the channels on the roller tube and slide it all the way down to install it.
Do not lace the awning corner back on until the glue has set up completely.
Glue it in place from the underside pressing it well.
Unlace the awning far enough that you can lift up the corner.
Unroll the spring with a vise grip slide the spring out of the roller tube and roll the old fabric off of it.
This is how i do it as a single person two or more people would be a different procedure and is the procedure seen in many othe.
This is strong enough to patch roofs on rvs or campers and does marvelous on awnings for all fabric types.
Follow the instructions below to reinforce the stitches on the fabric awning so that it will last a long time.