Extending Windows Trial Version License

Here are the instructions:

Step 1: Click Start, and then click Command Prompt. 

Step 2: Type slmgr.vbs -dli, and then press ENTER to check the current status of your evaluation period. 

Step 3: To reset the evaluation period, type slmgr.vbs –rearm, and then press ENTER. 

Step 4: Restart the server.

This resets the evaluation period to 60 days. 

You have a total of 2 trial extensions, after that you will have to get a license or reload the OS.