Mobile Menu Covers Header Image

Hello, I purchased Clean Business Pro on June 19, 2017. The web address is http://www.austinwelch.com/ In the mobile and tablet version the mobile menu covers the header image. I saw that you issued an update in September of 2017 in this post: https://catchthemes.com/support-forum/topic/clean-business-pro-masthead-issue-on-mobile-devices/ but I don't see a clear way to access/install that patch. How do I fix this issue? Thank you