Hi [NAME] welcome to this free user-to-user Alienware laptop discussion forum.  Please download and run Belarc Advisor to get detailed profile of your Alienware x15 R2 laptop (including Software Licenses). Download Belarc Advisor - MajorGeeks.   Does the OS (C:) boot drive have sufficient capacity so that dual boot drive can be deployed? How to create a dual-boot setup on Windows 11 | Windows Central.  
My computer is installed with Windows 11. But it seems that Windows 11 doesn't work well with some extremely old games and some Japanese galgames. Seems that locale emulator doesn't work well on Windows 11. So I want to install a Windows 10 on the computer. However I have some concerns: 1 Does the AWCC have a Windows 10 compatible version? 2 It is a gen12 intel, which has p cores and e cores. I've heard that the coordinate of these two types of cores is implemented in the Windows 11 only. So if I downgrade to Windows 10, will I lose some CPU performance? 3 How to find the cd key for this Windows 11 OS system on the computer? 
x15 R2, downgrade to Windows 10? cause any major problems?