1. Install scarlet#
Based on system 16.5, able to access the external network environment. (The feasibility of beta version 16.6 is uncertain, other systems should be fine)
Open the page in a browser (Google Chrome): https://usescarlet.com/
Scroll down, find "install", click to enter. Choose Direct install (the top one) for installation.
After installation, go to Settings > General > Device Management to trust the certificate.
2. Install the IPA file#
Open the Scarlet software, go to the middle page, click on the download icon in the top right corner, select the IPA file to download and install.