https://adrenaline.sarcasticat.com/docs/02-Install.html#update
This is the manual option.
That is probably because you already updated manually, or because you launched the EPI updater from ARK.
No, we (or more specifically, isage) are working on creating a way to launch Adrenaline from an app URL (similar to what retroarch does). With that done, it will be possible for custom launchers to launch the Adrenaline game directly, and for people to create bubbles that launch Adrenaline with a game set. No ETA on that, it will be done when it is done.