Beginning around December 5, 2019 ExpressTV users can update to TiVo Experience 4 by following the simple steps below.
Step 1: Make sure to upgrade the main TiVo box first!
Step 2: Go into the App section on your TiVo
Step 3: Select Upgrade to Experience 4
Step 4: At that point, you will follow a couple additional prompts.
Step 5: Once the upgrade is complete, you will need to upgrade any other TiVo Media Players in your home.