The website is this page right?
It says here that everything in the free DLC is also included in the paid DLC so you should only install that version if you have purchased it. Sorry if I am misunderstanding the issue.
I have a few questions that might help figure out the issue you are having.
1. Did you download and install the updated version of the base game?
2. Did you install the DLC to your base game correctly for the type of operating system you are using?
3. If you have done the first two questions and still had an issue, have you tried redownloading and reinstalling the game and DLC?
I have not gotten the ending myself, but from what I’ve read, there are other choices you need to make to actually get this ending.
You have to choose all the negative options for the characters in the game, go to Ren’s apartment on day 4 and say you enjoy seeing it, and then on day 5 tell Ren to leave after you see his text.
I don’t know how much better I can explain through text but I’ll try to be as specific as I can.
Part 1. When you download the DLC (Mac) you’ll need to un-zip the file by double clicking on it. You’ll get the DLC folder you’ll need for later in part 2.
Part 2. With your mouse, hover over the 14DWY base game app you should have already installed onto you computer and right click on it. A menu will pop down with a bunch of different options. The second option from the top should be called “show package contents”. Click on that one.
From there you’ll be brought to a new folder called Contents. Click on it and go to the folder Resources and then to the folder auto-run and then, finally, the game folder.
(click folders in order: contents > resources > auto-run > game)
Once you get to the game folder, take the folder you got from un-zipping the DLC and place it directly inside the game folder.
After that, you should be able to play the game with the DLC installed.