Hi
Did the download over the weekend - same issue as yours.
Just in between (I think file 5.rar…?) the extraction of the files the message appears.
Will download the *.RAR files ones more with a faster download line - hope this will help.
Thanks for your report, that there is hope, if the download is made several times 
Update 19.02.2016
OK. After re-downloading three of the seven files several times - finally I could install and operate the VST instrument - sounds really good - after long loading times. So far so good 
Cheers