unRAID Install
Unpackerr is available in Community Applications on unRAID. Install it from the Apps page.
The golift template mounts appdata at /config, publishes port 5656 for
the web UI, and runs as --user 99:100. Configure Sonarr, Radarr, Lidarr, and
the rest in the browser after install. Do not put Starr URLs and API keys back
into environment variables unless you want those fields locked in the UI.
Upgrading an existing 0.x container? See Upgrading to v1.

On the install screen, set Downloads Location so it matches your Starr apps
(next section). Leave appdata at /mnt/user/appdata/unpackerr/ unless you
prefer another folder. Apply, then open the WebUI.
First login is user admin. The password is printed once in the container log
(Generated temporary UI password). Change it in Settings.
The most common misconfiguration on unRAID, by far, and it's not even a close
second, is having the correct path mounted for your download location. As you
see in the screenshot below, a host path of /mnt/user/downloads with a
container path of /downloads is almost certainly not what you want.
Do this:
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Go into Unraid.
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Click on Docker.
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Enable Advanced View; toggle is in the top-right.
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Look at the mounts for Sonarr and/or Radarr. You're looking for the one that begins with
/data <->or/downloads <->. -
You want to make sure Unpackerr looks identical. See below.

If the highlighted portions above are not identical to the one below, then
things are bound to work poorly. In other words, if Unpackerr has
/downloads <-> /mnt/user/downloads and Sonarr has
/data <-> /mnt/user/downloads, Unpackerr will not be able to find your files.
In this hypothetical, you must edit the Unpackerr /downloads mount, and
change the Container Path to /data so it matches Sonarr.
Permissions
The template Extra Parameters already include --user 99:100 (unRAID
nobody:users), which matches typical linuxserver Starr containers. Change it
if your Sonarr/Radarr uid:gid is different. Other containers use PUID and
PGID; the golift image does not.
The appdata folder and the config file inside it must be writable by that same user, or the UI cannot Save. If needed:
chown -R 99:100 /mnt/user/appdata/unpackerr
Video Guide
This guide is provided by a community member, @Celsian, consider giving him a sub and a like. It was recorded against the old env-var template; ignore the Sonarr/Radarr variable fields and use the web UI instead. The download-path matching still applies.