Currently Being ModeratedFeb 3, 2013 6:08 PM (in response to Donna164)
Simply upgrading to the latest iOS shouldn't disable you from downloading pictures to your computer. In any event, you would want to backup your device before updating and also try transferring any pictures you have from your iPhone to your computer before you do any update, just in case something happens.
You can follow this article to make sure your pictures are safe before you update:
Remember to backup your device first.