The installation appears to run and doesn't give any errors. However, there is no folder created in Program Files and I cant see any new menus or buttons in DW.

I will provide a link to MXP file and binaries and a way how to install manually.

http://grafxsoftware.com/download/cvs2.mxp
http://grafxsoftware.com/download/cvsnt.zip

Unzip into Program Files/CVS4DW/ the binaries (cvsnt.zip)
Then run cvs2.mxp with Dreamweaver Extension Manager.

After this you need to add Program Files/CVS4DW/ to ENVIR PATH in Windows, you can check it if from command line you enter "cvs -v", you should get back the version of CVSNT binaries.

OK, we have found a possible bug. When is 2 DW installed on computer (Adobe DW8 and DW 9 for example), then will ask to choose one. If you do not select any of version, will install correctly.
After you install and if you want to add to the other DW, not what installer choosed by default, then go to C:\Program Files\SVN4DW\ and from there install the MXP file.