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.

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.

Look for and open the Roblox folder. Select everything inside by pressing the Ctrl + A hotkeys and then Shift + Delete to permanently delete the selected content.