HOW TO CHECK AND UPDATE  :-Settings (press Windows and I keys together) >> Update & security >> Activation

OR

Control Panel >> System and Security >> System

Windows 10 Product Keys List Free Download:

VK7JG-NPHTM-C97JM-9MPGT-3V66T
W269N-WFGWX-YVC9B-4J6C9-T83GX
MH37W-N47XK-V7XM9-C7227-GCQG9
TX9XD-98N7V-6WMQ6-BX7FG-H8Q99
DPH2V-TTNVB-4X9Q3-TJR4H-KHJW4
W269N-WFGWX-YVC9B-4J6C9-T83GX
WNMTR-4C88C-JK8YV-HQ7T2-76DF9

Windows Server 2016 All Versions:

Windows Server 2016 Datacenter Key	CB7KF-BWN84-R7R2Y-793K2-8XDDG
Windows Server 2016 Standard Key	WC2BQ-8NRM3-FDDYY-2BFGV-KHKQY
Windows Server 2016 Essentials Key	JCKRF-N37P4-C2D82-9YXRT-4M63B

Windows 10 Product Keys for All Versions:

Windows 10 Professional Key	W269N-WFGWX-YVC9B-4J6C9-T83GX
Windows 10 Professional N Product Key	MH37W-N47XK-V7XM9-C7227-GCQG9
Windows 10 Enterprise Key	NPPR9-FWDCX-D2C8J-H872K-2YT43
Windows 10 Enterprise N Key	DPH2V-TTNVB-4X9Q3-TJR4H-KHJW4
Windows 10 Education Key	NW6C2-QMPVW-D7KKK-3GKT6-VCFB2