May a workaround. I'm just pissed this happens. Yes the replacement screens are cheeper that a whole new screen system....Why don't they tell you this will happen so you can plan ahead???
I'm going to try to make some kind of jig to grab on to each corner loop and turn a crank to stretch the screen....Maybe it might work.
But can you guess who will never buy another Da-Lite product? And I have installed several of them...
Careful with the corner loops, they will tear under enough force. Heat is your friend