To set up HTTP Debugger for the Roblox UWP update bypass, follow these steps:
Install and run HTTP Debugger
If the "Decrypt SLL" Prompt shows click "Decrypt SSL"
Enabling "Decrypt SLL"
Create a file on your desktop called "bypass.txt".
Edit the contents of "bypass.txt" and input {"data":{"UpgradeAction":"None"}}.
Click on Auto-Reply at the top of your HTTP Debugger.
Clicking in "Auto-Reply"
Click on Add Rule > With File
Creating a rule
Locate your bypass.txt in the file explorer and click "Open"
Make sure the url type is set to "Exactly Matches" and the url to "https://www.roblox.com/mobileapi/check-app-version?appVersion=AppUWPV2.592.586". After that click on the save button.