How to use trial version of the software after trial date

we have lots of software(IDM,antivirus s/w etc) of trial version,and after trail date the s/w stop working. and it wont work after re-installing the software.here is a trick which will allow you to use the s/w as a trial after trial period.
1. open run and type regedit.

2. a window will pop-up. before doing anything go to the file option and import the bakup file to a specific file. this is the backup of the registry settings in case of any problem we can restore the setting from this file.

3.now go to the HKEY_CURRENT_USER -> SOFTWARE this folder contain all the files which we have already installed on the system or copy of the software which is uninstalled.

4.so after uninstalling the trial version of the software remove the folder of the software from here,now re-install the software and use its trial version again without formatting your system..

enjoy the tricks