You gotta download it pretty sure to get the ending.

I'm not sure if there's a non-downloadable version, but I can look for it if you'd like. Of course, you could also just use external and cloud-based storage, or remove some other files for the game (which is 300 MB, or 0.3 GB). If you'd like to remove files, simply sort your files by size and delete at least 300MB of space (about the size of a 5 minute .mp4 video).