This update will only function if you have already installed CVTWIN, v. 1.0.17, or later, using its SETUP.EXE program. If you haven't, then download CVTWIN-SETUP.EXE from http://www.dshield.org/windows_clients.php and install this.
INSTALLING THE UPDATE
Unzip and copy the files from this zip file to the directory you installed CVTWIN to, typically, C:\Program Files\cvtwin, and restart CVTWIN. Or unzip this directly in C:\Program Files\cvtwin. Whatever, you just need to get the files that are contained in this zip file to the directory you had previously installed CVTWIN.