Hello, I am trying to take a computing class. I have a macbook air running big sur (I cannot update it past that). I was told for the class that Big Sur would be sufficient. It appears that I don't have xcode however and I need it on my computer. I cannot find any version to download from Apple besides the newest- which isn't compatible with Big Sur. I have found some older versions online but I don't know what to trust. I was told I could download it here but am not finding it. I think I need one of the versions in the 11s Please help!