At this I fell at his feet to worship him. But he said to me, “Don’t do that! I am a fellow servant with you and with your brothers and sisters who hold to the testimony of Jesus. Worship God! For it is the Spirit of prophecy who bears testimony to Jesus.”
Context: After the downfall of Babylon, there is great rejoicing. The marriage of the Lamb and his Bride is announced. John drops to worship the angel, but he is instructed to only worship God. The Heavens open up and Christ appears to judge and make war. After defeating kings, commanders, and warriors, Christ goes to war against "the beast" and false prophet. They are cast into a lake of fire.
The Catholic takeaway of that verse is that we only worship God.
Now what does the KJV say?
That's biblical gymnastics, adding things that aren't there. The angel states, the testimony of Christ is the spirit of prophecy. So that means, prophecy plays a big part of last day events and Jesus is pretty clear, we need to take prophecy to heart.
Who the 'beast' is, sure is a fun study :)