Fresh raw caow liver juice was part of Gerson protocol. More than a few people got sick and a couple have died from bacteria in the livers. Now, Gerson Institute recomends desicated liver tablets. My point is that Gerson was a genius 80 years ago. He would still be a genius today, but his methods and protocol would be very different based on the knowledge and technology that we have today. Since Gerson is not here to make the changes, we must make them ourselves. We can not shoehorn ourselves into an 80 year old protocol.
Gerson's basic diet is very similar to "The Cancer Battle Plan", The Kelley Method, and many other more modern plans. The difference is the modern plans include suppliments that did not exist (or were not widely known) in Gerson's time.
Use a quality masticating juicer. I would not worry about carrots & apples together or seperate. Quality juice is good, and good for you, either way.