Link to the mLRS project.
Download the file mLRS_Flasher.zip from the "app_windows" folder and store it to somewhere on your drive. Unpack it, and run mLRS_Flasher.exe.
You can create a desktop shortcut to this file for easier access also.
Open the terminal and run the following commands to install Brew, Python and the virtualenv module - this only needs to be done once.
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
brew install python
pip install virtualenv
./run_mLRS_Flasher_mac.py
TBD
You of course use the app fully at your own risk.