How to reset the trial period of software to work it lifetime?

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 First uninstall the software and follow the steps.

*. After uninstalling software, OpenRUN (Windows key + R) and type regedit and hit Enter.

*. Now Registry Editor Window will appear and here navigate to 
HKEY_LOCAL_MA CHINE \ SOFTWARE \ Your Software name from left pane of this window. If
you find any Key name with your software name then just Delete that Key.
 
*. Similarly navigate to HKEY_CURRENT_USER \ Software \ Your Software name and if
you find any key with your software name then just Delete it and close the Registry Editor window.
 
*. Again go to RUN and type %temp% and hit Enter.
 
*. Now Delete all the things in that folder. Don’t worry these are the temporary files and not necessary for your operating system.
 
*. Now go to C:\Users \your username here \AppData.Un der AppData open all three
folders"Local","Local Low" and "Roaming”and check. Under these three folders if you find
any folder or anything with your Software's name, just delete it. 

*. Now Restart your PC and install the expired software and you can use it again for trial period."