This question, Can I reinstall Windows 10 once I upgrade?, seems to appear more and more on social media, and it’s a good one, now the reservation possibility has gone out, many users are wondering these kinds of questions. The simple answer to this question appears to be: Yes, you can, at least according to several Microsoft Moderators and Employees.
Yes. Once you upgrade to Windows 10 successfully using the free upgrade offer, you will be able to clean reinstall Windows 10 on the same device during and after the free upgrade offer period without having to purchase Windows 10 or having to go back to the prior version of Windows that you upgraded from.
Rohit Siddegowda, Microsoft Forum Moderator
More Frequently Asked Questions:
Q: Will I need to go back to Windows 8 or any earlier system and upgrade again after reinstalling?
A: No, there will be no need for this.
Q: When Can I Reinstall Windows 10?
A: There is no time limit set to it, it seems you can choose at any moment to Reinstall Windows 10.
Q: How will I reinstall Windows 10, If I don’t have any installation media and my computer doesn’t boot anymore
A: We cannot answer thay question at this moment.