Hi friend, what kind of stuff do you want to download from iPhone? If you wanna back up personal files like photos and videos, then you can take a look at this official guidance. https://support.apple.com/en-us/HT201302
If you have downloaded some non-purchased songs on your iPhone and want to save them onto computer, here's also a guide and a tool to help. 3 Ways to Transfer Music from iPhone to Computer
Yes, you can install iTunes on your computer to sync data to your iPhone, however, it will cause the erase of your existed iPhone data.
So you may need some outside help. How to Transfer Photos from Computer to iPhone 6 Plus
You have to use Itunes to transfer between Iphone and Laptop. Connect your Iphone and sync using Itunes. You can transfer photos,pictures,music etc ...
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