I downloaded tonights version of the PC "Try It", with the same activation code errors. To ensure I was using the lastest version, I
* Removed the setup.exe from 4/16
* uninstalled VF2 files and folders from 4/16
* ran the setup file downloaded 4/17.

I have Vista and McAfee - My download still says the file is unsigned. I bypass this error by selecting the option to run anyway.

After all the files are extracted and given the option to start VF2 still get error.
"The security key for this program currently stored on your system does not appear to be valid for this version of the program. Select Yes to enter a new key, or No to revert to the default setting (if any)."