Thanks for reaching out here and welcome to the Community!
If you need help with your downloads, we suggest to check out this support page. Should you not find the answer to what you're looking for there, let us know what your issue is and we'll be happy to help you out.
In the meantime, if you want the Offline Devices back in your Account Overview, you can head over to this idea and add your +VOTE.
Spotify Staff will look into this idea once it reaches the necessary amount of votes. More information about how the Spotify Idea Exchange works can be found here.
Hope you'll find this info useful. Give us a shout if there's anything else you need help with 🙂
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