The demo version is for a limited period and the premium version is a lifetime period. And in the demo version, you can't use software all functions. But in the premium version, you can use its all function. I have downloaded antivirus online but it was a demo version and I can't use it's all function. But I am glad because I have got its key for using
Resumes Help Service in the past. I can't remember the company name of that resume service otherwise I will surely share it with you. Maybe you can win an avast antivirus premium version key.