Hi Akash. We're not sure at the moment how we can help you with the texture problem as it's not happening on our end, plus we don't have enough information, so we can't debug it and check what's wrong. For now, our best guess is your graphis card might be a bit old and can't process the textures properly.
As for the update, where did you buy the game? If you bought it here on Itch.io, you should have v1.1.1 automatically. If you buy it on Steam, it should also automatically update to the newest version.