As far as I know, you can only download MacOS's version from itch.io. There is no way to get MacOS's version through Microsoft Store unless Microsoft wants to port their store to MacOS :)
You can request a refund to Microsoft, which will be processed for 2-3 working days. Faster than itch.io's refund.
And you can buy the itch.io version now, with three platforms included for Cider.
itch.io is better than Microsoft Store's version in my opinion.