They do seem to have spoiled what was a really good App with the latest update. It appears, in a daft attempt to keep up with the jones's, they have tried to add too many bells and whistles at once and spoilt the overall feel of the app. I now find it a real pain when off grid, as the 25k maps I have loaded on my phone try to switch to a 50k map that is not there and instead just give me a blank screen unless I am zoomed right in. I have told them about this, but received no feedback.
Back to your problem. It appears you can only use your downloaded maps on a device that has a sim in these days. I can no longer view them on my home tablet, only on my phone. Another backwards step.