Re: Since updating my iPhone it will not let me download photos into my computer.
If I'm correct, you are referring to previous iOS automatically opening the Photos app on your computer and importing them. Same thing as opening iTunes. While I don't have advice to get it to automatically do it...here's a work around.
Plug in your iPhone. Open Photos, click File, Import and the photos should import into your Photos app.
For iTunes, just open iTunes and then plug in your iPhone and you should see it appear and be on the summary page.
*Not sure cause I haven't tried but you may be able to open iTunes and change the settings to automatically open and sync with Photos and open your iPhone upon plugging in. They may have just reversed the defaults.