Sorry for the lengthy title but as the free offer for windows 10 is coming to an end, I am thinking of upgrading last minute. But, even if I do upgrade, I dont know if the rollback option will still stay the typical 30 days after the free offer is up. So I am curious. Would it be impossible to upgrade to windows 10 temporarily and be able to roll back to windows 8.1 after july 29th (Or the Free Upgrade Offer's End Date)?