Looks like a one time thing. You need to have the apk available so your bitchat can share it with someone. Download it once and maybe it will always be there?
This is what Briar did and it's pretty cool. We tested that one time on a flight. Briar didn't have to download anything though, it was immediately available to do this.
Users that don't have bitchat and internet, can now download it via a wifi hotspot created by a bitchat users, where it can be downloaded.
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