Albums are not available offline, even while online I had previously downloaded them. This only happens in Windows, on Android the same albums downloaded, at the same time, can be accessed normally offline.
Welcome to the Community and thanks for reaching out about this.
Would you mind letting us know what happens exactly when you want to listen to your downloaded content on the desktop app?
Additionally, could you let us know if this only happens with albums or with your playlists as well?
Lastly, could you send us the exact make/model, operating system and Spotify version of your device? Additionally, sending us some screenshots of how you're seeing your downloaded albums on your end would come in handy.
We'll be on the lookout.
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“Music acts like a magic key, to which the most tightly closed heart opens.”– Maria von Trapp