Stagefright patch question

I have AT&T, rooted but otherwise stock ROM. System keeps D/L the stagefright patch. Does anyone know where the file goes? When the M9 reboots, it goes into TWRP and the patch never installs. Can I manually select location from inside TWRP? If it's saved in an inaccessible location, a link to manually D/L the upgrade file would also be most appreciated. Thanks!

~Vol

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