IWR6843AOPEVM: Uniflash does not work on MacOS BigSur

Hello,

I got IWR6843AOPEVM, following the guide here to flash out-of-the box demo
https://dev.ti.com/tirex/explore/node?node=AIHy77joqu3jXFmjqwkBKQ__VLyFKFf__LATEST

I installed the MacOS version, and cloud version, both of them throws the error python2.7 not found.

Here is the error on the MacOS

And the cloud version also have the same issue:

I followed all the guide very strictly (installing all related packages, libs, extension for Chrome). But it doesn't work.

I am using MacOS Big Sur, 11.2.1 (20D74)

My mac has python 2.7 by default:

python --version
Python 2.7.16

I cannot flash the firmware, and it's a kind of blocking issue now, could anyone help? Thank you!