Step 1:
Open up CMD as an Administrator and run the following command;
Slmgr.exe /upkStep 2:
First you need to get GVLK Key to proceed;
| Server Edition | Product GVLK |
| Windows Server 2019 Datacenter | WMDGN-G9PQG-XVVXX-R3X43-63DFG |
| Windows Server 2019 Standard | N69G4-B89J2-4G8F4-WWYCC-J464C |
| Windows Server 2019 Essentials | WVDHN-86M7X-466P6-VHXV7-YY726 |
| Windows Server 2019 Azure Core | FDNH6-VW9RW-BXPJ7-4XTYG-239TB |
| Windows Server 2019 Datacenter Semi-Annual Channel (v.1809) | 6NMRW-2C8FM-D24W7-TQWMY-CWH2D |
| Windows Server 2019 Standard Semi-Annual Channel (v.1809) | N2KJX-J94YW-TQVFB-DG9YT-724CC |
| Windows Server 2019 ARM64 | GRFBW-QNDC4-6QBHG-CCK3B-2PR88 |
| Windows Server 2016 Standard Semi-Annual Channel (v.1803) | PTXN8-JFHJM-4WC78-MPCBR-9W4KR |
| Windows Server 2016 Datacenter Semi-Annual Channel (v.1803) | 2HXDN-KRXHB-GPYC7-YCKFJ-7FVDG |
| Windows Server 2016 Datacenter Semi-Annual Channel (v.1709) | 6Y6KB-N82V8-D8CQV-23MJW-BWTG6 |
| Windows Server 2016 Standard Semi-Annual Channel (v.1709) | DPCNP-XQFKJ-BJF7R-FRC8D-GF6G4 |
| Windows Server 2016 ARM64 | K9FYF-G6NCK-73M32-XMVPY-F9DRR |
| Windows Server 2016 Datacenter | CB7KF-BWN84-R7R2Y-793K2-8XDDG |
| Windows Server 2016 Standard | WC2BQ-8NRM3-FDDYY-2BFGV-KHKQY |
| Windows Server 2016 Essentials | JCKRF-N37P4-C2D82-9YXRT-4M63B |
| Windows Server 2016 Cloud Storage | QN4C6-GBJD2-FB422-GHWJK-GJG2R |
| Windows Server 2016 Azure Core | VP34G-4NPPG-79JTQ-864T4-R3MQX |
Step 3:
Open up CMD as an Administrator and run the following command; Use GVLK Key from the above table according to the edition.
Dism.exe /Online /Set-Edition:ServerStandard /ProductKey:XXX-XXX-XXX-XXX-XXX /AcceptEula
It will take some time to complete then it will go for restart;
Step 4:
Once Windows Server 2019 is back open up CMD and execute the following command; This time use your original key which you have purchased.
slmgr.exe /ipk ABCD-EFGH-IJKL-MNOP-QRST
Next you have to run the following one;
slmgr.exe /ato
Step 5:
Once you are done, you can verify by using the following command;
Dism.exe /Online /Get-CurrentEdition
You are done !
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