How to activate windows 8 or 10 products by avoiding all errors

Here are few windows 10 keys:

Windows 10 Serial Key : VK7JG-NPHTM-C97JM-9MPGT-3V66T,NKJFK-GPHP7-G8C3J-P6JXR-HQRJR

Windows 10 Serial Key Technical Preview for Consumer : 334NH-RXG76-64THK-C7CKG-D3VPT

Windows 10 Preview for Enterprise : PBHCJ-Q2NYD-2PX34-T2TD6-233PK 

Windows 10 Home : KTNPV-KTRK4-3RRR8-39X6W-W44T3,TX9XD-98N7V-6WMQ6-BX7FG-H8Q99

Windows 10 Home Single Language : 7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH

Windows 10 Pro : 8N67H-M3CY9-QT7C4-2TR7M-TXYCV,VK7G-NPHTM-C97JM-9MPGT-3V66T

Windows 10 Home County Specific (CN) : PVMJN-6DFY6-9CCP6-7BKTT-D3WVR

Windows 10 Home N : 3KHY7-WNT8-DGQKR-F7HPR-844BM

Windows 10 Professional : W269N-WFGWX-YVC9B-4J6C9-T83GX,VK7JG-NPHTM-C97JM-9MPGT-3V66T,8N67H-M3CY9-QT7C4-2TR7M-TXYCV

Windows 10 Professional N : MH37W-N47XK-V7XM9-C7227-GCQG9,2B87N-8KFHP-DKV6R-Y2C8J-PKCKT

Windows 10 Enterprise : NPPR9-FWDCX-D2C8J-H872K-2YT43,XGVPP-NMH47-7TTHJ-W3FW7-8HV2C,CKFK9-QNGF2-D34FM-99QX3-8XC4K

Windows 10 Enterprise N : DPH2V-TTNVB-4X9Q3-TJR4H-KHJW4,WGGHN-J84D6-QYCPR-T7PJ7-X766F

Windows 10 Enterprise S : FWN7H-PF93Q-4GGP8-M8RF3-MDWWW

Windows 10 Education : NW6C2-QMPVW-D7KKK-3GKT6-VCFB2,YNMGQ-8RYV3-PGQ3-C8XTP-7CFBY

Windows 10 Education: 2WH4N-8QGBV-H22JP-CT43Q-MDWWJ,84NGF-MHBT6-FXBX8-QWJK7-DRR8H

Windows 10 Enterprise 2015 LTSB: WNMTRT2-4C88C-JK8YV-HQ7T2-76DF9

Windows 10 Enterprise 2015 LTBS N: 2F77B-TNFGY-69QQF-B8YKP-D69TJ

Windows 10 core : KTNPV-KTRK4-3RRR8-39X6W-W44T3,

Windows 10 core SCRingle Language : BT79Q-G7N6G-PGBYW-4YWX6-6F4BT,JPYNJ-XTFCR-372YJ-YJJ4Q-G83YB,JPYNH-XTFCR-372YJ-YJJ3Q-G83YB,R3BYW-CBNWT-F3JTP-FM942-BTDXY (CN)

ESD ISO : 6P99N-YF42M-TPGBG-9VMJP-YKHCF

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Now open command promt with administrator rights.
Click start > Search for command prompt > right click on it and select run as administrator.

Now type this :
slmgr /ipk 7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH

You will get a message, windows 10 is successfully activated.