Update Go lang code

I have some existing code written in Go lang, it needs to be updated to connect to a s3 bucket and download a file. This is urgent and I need to get this completed in the next 48 hours. It currently is connecting to AWS Parameter store and AWS SMPS to download and publish the files. I can provide access to the code, but it will be via video call. It should be a quick update as I have the line of code that needs to be added, just need help with the formatting and layout, I wold like to learn it as well so would be good