Update on MotoG [falcon] fails, zip not found

Summary

I have the 20180911 zip installed. It find the 20180912 update, downloads it and tells me that it will boot into TWRP recovery. It does but the downloaded zip is nowhere.

Steps to reproduce

• download update
• reboot into recovery

What is the current behavior?

• can not find the zip to be installed

What is the expected correct behavior?

• downloaded zip is in /sdcard/Downloads

Possible fixes

Before rebooting, in the dialog display the path where the download will be when rebooted into TWRP.