Wordfast Pro 3 for OS X requires Java 6
Wordfast Pro 3 for OS X (currently version 3.4.5) requires Java 6. If Java 6 is missing, you will not be able to run Wordfast Pro 3. You will see this message:
When you click More Info..., you will be taken to an Apple support web page with links to download Java 6.
Download and install legacy Java 6. As do so, you will see this information:
Once you install Java 6 in your OS X, you will be able to run Wordfast Pro 3. Note that with recent OS X versions, you may run into a security message saying the app can't be opened because it is from an unidentified developer.