Installation

fission is not distributed through an app store. Installing it is a normal sideload on a device you own.

The steps below are the same text as the installation section of the public releases repository's README. Both are generated from one source, so the two cannot drift apart. No step here is written for the website alone.

Install (Android TV, sideloaded)

fission is not distributed through an app store. Installing it is a normal sideload on a TV you own.

With Downloader (easiest)

4188438

That is fission's permanent Downloader code. It opens https://fissionplayer.stream/download/, the project's own download page.

Install Downloader by AFTVnews on your Android TV, from the Google Play store listing at https://play.google.com/store/apps/details?id=com.esaba.downloader.
Open Downloader, enter the code above, and choose the newest version on the page it opens.
Let Downloader download and install the APK. If Android asks, allow it to install unknown apps — that is Android's own protection, not an fission setting.
Open fission and complete first-run setup. Add a Jellyfin connection and/or an add-on only if you want one.

With adb (a computer on the same network)

On the TV, enable Developer options (Settings → System → About → tap Build seven times), then enable USB debugging and/or Network debugging.
From the computer, connect with adb connect <tv-ip>:5555 and then run adb install -r infusion-tv-<version>-<versionCode>.apk.
Open fission and complete first-run setup.

Upgrades install over the top with the same command (-r). Updates are installed by hand at this stage; no app store will notify you.

Before and after

Download — where the installer comes from, and how to check its checksum and signing certificate before you install it.
Releases — every published public alpha.
Support — if something does not work.