After putting it off for literally years, I decided to upgrade my Late 2015 Macbook Air from Yosemite to Sierra. It went seamlessly, but now I am dealing with a problem with iTunes and the APP store. About 15 months ago, I got locked out of my Apple ID because of losing my two-factor key number to reset my apple id password. After the efforts of the Apple Care crew, I was able to create a new Apple ID and have everything disconnected from the old one, including find my iPhone etc. Now the App store is back to asking for the password for my old Apple ID and there is no way to change that ID in the ID field because it is grayed out. Since I had lost the password for that old ID, I can't do any more updating of apps or operating systems. I did manage to sign into my apple mail account and log into iCloud with my new ID, so it seems to be local to the app store and iTunes. Does anyone have an idea about how to resolve this. --- Post Merged, Jun 3, 2018 --- Ive just thought of something. Maybe it is because the apps I am trying to update were installed originally with the old id. I managed to update Dashlane today with my new ID. But the ones that ask for the old id are garage band, pages, numbers, keynote and daisy disk. Since I never use any of them, can I uninstall them? How would I do that. And if I then wanted them back, would I have to pay for them?