The software will run for as long as you want, but the problem is you won't have the possibility to actually clean those registry keys that have been detected. The PRO version is needed, therefore you have to buy it. While it may cost you a little, I recommend choosing a free solution that can be used anytime and anywhere. It's called CCLeaner and I use it every day with my PC.
Note: I can guarantee this doesn't break the operating system's stability and can be used safely.