Snap is the name of the stock LOS camera app.
Snap is only available for users using LOS, and what you linked to is not Snap the LOS camera, it’s a random camera app which doesn’t seem to have been updated for 3 years, please don’t mix things up.
There is a duplicate discussion in the Lineage topic, I think it would be better to discuss it down there. I’m tentatively closing the topic here so the discussion can go on over here, please tell me if you’d rather keep this topic.