Help update new firmware via TWRP - Where is package file/folder

[Schildkamp]

Hi. I just got a notification telling me a new firmware was available for my i9505. I use TriangleAway to mask that my phone is rooted. However, when trying to update, the phone will reboot into TWRP, and thus unable to install/update further from there. I guess the easy solution would be to 'force' install via TWRP, but I'm unable to find the downloaded installer package. Any ideas to where the package is hiden, - or better ways to do this?