Why is this post under "Classifieds"?
What is this... the window of a panel van?
In any case... you're asking too much of this vinyl. Wrap films aren't designed to be stretched that much, regardless of how much you heat it up (even if you use primer). It's going to lift back up in no time (maybe a few hours or a few days). You need to trim out that window and lay the rest around/underneath it.