Now the AppData folder will appear. Go into the Local folder to find the Roblox folder. Delete the entire Roblox folder. Run the installer as Administrator.

Now, find the Roblox folder in the opened directory and double-click on it to open it. After that, right-click on the blank space in the folder and select the New > Folder option.

Then, enter roblox.com in the search box and then press the Delete icon present next to the Roblox website. Once done, clear the Roblox cache from the Temp folder using method (1).

Roblox error code 403 is caused by an authentication error. Here's how to fix Roblox error code 403 once and for all.