As I said before, all retrofits suck. There is no way to properly waterproof them. Stucco is porous. They are waterproofed by using silicone to the stucco.
Where does the water go, that soakes into the stucco above the window? It runs down the inside of the stucco, against the tar paper, until it hit the top of the window, where it would normally flow to the outside. That's how waterproofing works. But with a retrofit, you have that outside trim fin to dam the water from exiting. Where does it go? Into the framing.
But people pay me thousands to replace a rotted header. I just got paid 1200 yesterday to replace a termite eaten post. Took about 6 hours.
Damn, I love water and termite damage and deferred maintenance.,