Hello Marcino and welcome,
Every virus C goes out with a copy of Soundiver. Mine is a CD in a sachet which says Saturation on it and has a picture of the Virus C. I'm not sure what file you're clicking on there, I'm pretty sure it's the wrong one. Find the CD, stick it in the drive and it should just start the install wizard for you. Failing this, I would download the one from the site. Have a look at page 39 in the Virus manual aswell, it'll tell you about Soundiver Virus.