If you have security software (anti virus) installed, disable that before downloading updates.
that I am asked for my password, I type it in click on update all (I have also tried clicking on individual updates), and then that circle thing appears to go round and round endlessly. Nothing gets updated
Try "resetting" your Apple ID password > Apple - My Apple ID
And other types of third party software other then anti virus can preent updates from downloading > Mac App Store: Sign in sheet does not appear, or does not accept typed text