Yesterday, when I wanted to download free youtube downloader I got infected. How did this happen, am I stupid?
No, It is not the downloader, it is when you install the downloader, that you have to be careful and very cautious of what to accept.
One step is that you can tic if you want to keep your pc clean
Who does not want to keep your PC clean and maybe use a program?
This is how I got infected with Optimizer Pro a Trojan, a fake of the PC optimizer you can buy.
This is what you should do instead, tic the mark off
Then you will avoid being infected.
This is social engineering, do not fall for that.