Ashley I understand what is happening now. but I'm now suggesting it be improved upon.
What is the point of the website remembering what version the user is on? since you give them no choice. Other than to say that there are release notes, I don't see a reason.
If there was a person that wanted to stay on r142. They would nav to editor.construct.net, get a message that the new version is release 142.3, then they would need to go to the address bar and type out editor.construct.net/r142 - then remember to go to that address every time they use C3.
from a UX standpoint, that is not very good design. It's just clunky and non-intuitive. An improvement would be to send the person to the correct link based on their desire to "update" or not.
That's just my advice, take it or leave it.. it's up to you.