activate windows from command line - slmgr
Temporarily extend evaluation period (limited execution - see output below)…
C:\Windows\System32>cscript slmgr.vbs /rearm
C:\Windows\System32>shutdown -r -t 1
Show detailed license information…
C:\Windows\System32>cscript slmgr.vbs /dlv
License Status: Initial grace period Time remaining: 43200 minute(s) (30 day(s)) Remaining Windows rearm count: 0
Activate windows…
C:\Windows\System32>cscript slmgr.vbs /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
C:\Windows\System32>cscript slmgr.vbs /ato
Will require access to the internet - most of the time the issues are either time sync or connectivity to internet.