Me and My Friend installed Win 10 Insider Preview long time ago i.e., before Win 10 release I installed on my PC and He on his laptop but while doing so he completely formatted his PC even his Backup and also converting to Legacy Boot and later Dual Booting with Kali Linux....but now he need to give his laptop to another guy and thus requires the original Win 8 to be installed is there any way to install Win 8 again apart from buying Win 10 Key