1. Download & Install Uninstaller first ZSoft here -> http://www.zsoft.dk/download.php?appid=4
2. After that run ZSoft Uninstaller, click "Analyze", Select "Analyze an installation", click "Next".
Check Drive where Windows is (usually on C:) and click on "Before Installation".
3. After the process is complete, install the Software Shareware / Trial who want to use as Winrar (to a limit of time, such as 30 days, etc.)
4. Once installed, run the software once and then Exit.
5. Back to ZSoft Uninstaller, click on "After Installation", wait until you are done and give the name as the name of the software. Done!
The next time the software trial is up, open ZSoft Uninstaller, Select Tab "analyzed Program", will have the name of this software. Right-click on the name of that software, Uninstall.
Trial Software Reinstall earlier, then the time trial will be back again.
Have a nice try!