Hello, Unfortunately, this is a monitor related issue. Laptops' displays does not support changing the contrast typically. I can make the refund if you want to. For this, request the refund in answer to the email with the license key.
Hello, Did you purchase a key? If yes, it should be sent to your email then. Please check your Spam folder. If you do not see it there, please send me your email you bought the key from, via the private message on this forum.