Producer 7.128 update installs but will not run

A while back I upgraded my PC. Now I want to install MixVibes on my new PC but cannot find my CD. sales@mixvibes.com tell that that is OK to download another copy (I registered my product on the forum when I bought it so my serial number is up there in my account etc). When I download the 7.218 update, it install OK but does not run - it gives me a "Bad Installation" message. sales@mixvibes.com tells me that the update is a fully runable product and that I don't need anything else. It doesn't look like this is the case. Any ideas?