No you don't. I've used this trick with lots of apps where my account did not meet that criteria. Including OneDrive, which I'd never used before 2020.The key is you have needed to have "purchased" the Microsoft app during the period when you need the older download.
Are you absolutely 100% positive that your wife was downloading from the purchased screen and not somewhere else in the app store? The trick only works from the purchased screen specifically.
If so, it's possible that Excel was pulled from the app store at some point and re-listed later. That would turn the current version of Excel into a different product as far as the store is concerned, so there'd be no older version to offer.
When I needed OneDrive for work, I solved this problem by buying a ludicrously large SSD. 😉However, this older version of OneDrive doesn't have the "Files On Demand" feature.
(I'm on a desktop though, it's a bit harder on a laptop!)
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