Dragon Age: Origins, Ultimate Edition DLCs

So I recently decided that I wanted to play DA:O again for the nostalgia and the game booted up fine, however, when I tried to load up one of my old saves, it came up with the message: "unable to load save game as the required downloadble content is not present on the selected storage device". I went to manage game and add-ons for DA:O and all the DLCs said they were installed, but figuring maybe it had been a while I decided to uninstall the game and reinstall again. I installed the base game on Disc 1 and then inserted the 2nd disc for the DLCs, but it just booted the game as normal and when I went to check the downloadable content option it was empty and didn't let me access the Xbox 360 list of DLCs. Moreover, all the DLCs that were previously installed when I went to manage game and add-ons, vanished. When I look on the xbox store it says I can buy them but there's no way I'm paying for the DLCs again.

Any help with this problem would be appreciated ��

Ps. I'm a tech noob so you might have to explain things to me ��

Update: I decided to uninstall it and reinstall it but with the 2nd disc instead and all the DLCs popped up, fingers crossed they'll work

:)