Even after your subscription ends, you are always able to download from Lightroom's cloud storage any image that you previously synced when you were still subscribed.
That error you showed is saying that the advanced feature you want is limited to paid users. However, please notice that the option to Download is still present. So you can download and see all images in your account. However, if they are Raw images, or if you try to use a premium edit feature on any image, those are abilities that rely on a subscription.
If I can clarify anything, please let me know!