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.

Fix #3: Update Roblox installation files. If Roblox is still showing the same crash error, the final solution that you can try is to update certain files in the installation folder.