With the line drawings for guidance, I started to look at photos, and chose to start by verifying the absence of a 40mm bow mount in 1945. In verifying that, I discovered a series of photos taken on September 13, 1945 by the Puget Sound Navy Yard of Enterprise as she was leaving the yard after repairs/refitting from a kamikaze attack on May 14th. They are very instructive. The war ended while Enterprise was undergoing this refit, and it was never completed. She left the yard "early," and incomplete.

Therefore, the undated late fit line drawing is of the INTENDED armament, had the refit been completed. And the notes on that drawing are of what actually was fitted vs. what that drawing shows was intended. (And this explains why that drawing is so hard to find while the 1938, '42, '44 series is so much easier to come by. Those were actual fits. That drawing is hypothetical only.)

What gives it all away most obviously is the photo at the top of this item:

https://en.namu.wiki/w/USS%20%EC%97%94%ED%84%B0%ED%94%84%EB%9D%BC%EC%9D%B4%EC%A6%88%20(CV-6)

And the preview shows the damned link goes to another--Star Trek--page. However, if you look, it says, "The actual ship that served as the motif for this shipthe contents aboutUSS Enterprise (CV-6) documentcastPlease note." And "Enterprise CV-6" is hypertexted. Click that to finally get to page I want to link. Sheesh!!

This is the most commonly encountered photo of the series of 4 that Puget Sound shot. Google-->Enterprise Puget Sound 13 September 1945, and select images. They should all come up, though I can not find a single source with them together. There is the above photo, one from the port quarter, from the stern, and the starboard quarter.

Looking at the above photo, notice the empty sponson forward below the flight deck, just aft the 5 inch mounts. That's why the note on the drawing says "delete." Those 40mm were never actually installed, though the sponson shows they had planned to. So, the Wiki armament listing for "September 1945" is missing the word "planned," or "intended," or some other indication that it was only how she would have left the yard had the war still been happening.

Further regarding the link I have given here... Note this item also contains an armament listing similar to Wiki's (but adds the late 1942 fit Dick has already given us, and only has 1945, not September 1945 for the final fit...still lacking wording that this was intended, not actual.) Also, it gives the three "valid" line drawings...'38, '42, '44 again.

So... Anyone choosing to build a model according to the late fit diagram is building a what-if, or else is correct ting it according to photos and the notes.