Hex file does not compile in win10 app

[abchatra]

Describe the bug
A clear and concise description of what the bug is.
User reports that microbit-light_level_external_sensor_v63.hex.zip will open in the makecode web editor and recompile, but not in the win 10 app which reports a compilation failure. The file also runs on the micro:bit hardware without error.

To Reproduce
Steps to reproduce the behavior:

1. Open attached Hex in Windows10 app
2. Click on Download
3. See compilation error

Expected behavior
Code should compile as in web app

Screenshots
Add screenshots to help explain your problem. You can copy paste the screenshot in the github report. The .gif screen recording is very useful as well.

Desktop (please complete the following information):

• OS: Win 10 v1803

App version is out of sync with browser version. Is it supposed to auto update?

[abchatra]

This hex file fails to download in Chrome and Edge browser as well

[abchatra]

microsoft/pxt-microbit#1745