I have an old Macbook Pro, currently running OS X El Captain Version 10.11.3. I tried to update it to OS Sierra, I downloaded Sierra, but the update failed many times so I decided to just cancel the update since this is not my main computer anyway. I no longer want to continue with the update, but the problem is, now I keep getting the error message that says "Your startup disk is almost full. To make more space available on your startup disk, delete some files." I think the Sierra download is taking up most of the space so I would like to find and delete those files. Does anyone know how to find the downloaded files for an OS update?