Adobe Express Issue (may be new computer)

I recently purchased a used iMac and transfered everythoing from my old iMac to the new one. Since then when trying to download a photo I've made in Express, I'm told to do this I need to upgrade to Premium and am not allowed to download. I'm logged in to my Adobe account and have a current 20 GB Photography subscription with plenty of space to use. Can anyone help me here?