I've downloaded the mxp file and installed... new menu shows in DW8... but nothing works... I get an error message about a js file....

What does your note mean "must have SVN client installed"?

Help... I want to use svn via dreamweaver... urgent

Our installer install automatically the client.
Can you send to us a screenshoot of the error to support at grafxsoftware.com?

We did not received the screenshoot, did you sent it?