CMD using SLMGR for Windows License

Check current license, detailed and concise

slmgr /dlv
slmgr /dli

Rearm activation trial, remaining Windows rearm count can be found in the current license info.

slmgr /rearm

Uninstall the product key of the current Windows edition

slmgr /upk

Remove the product key from the registry

slmgr /cpky

Install product key

slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx

Attempt online activation

slmgr /ato