Notes to myself because I keep forgetting.
tl;dr Unzip it into the /opt/ directory.
I want to install Filezilla - so I can SFTP files around. Sadly, the Flatpak version is unmaintained and the version in apt is out of date. Luckily, you can download the zipped version.
Their Wiki helpfully says:
If you have special needs, don't have sufficient rights to install programs or don't like installers, the zip version is there for you. A zip-file is a file that contains files inside of it. They are packed into one file and you need to unpack (unzip) them to use them.
But it doesn't say where!
The answer is the /opt/ directory.
Run this command:
sudo tar -xJf FileZilla_*_x86_64-linux-gnu.tar.xz -C /opt
The first time you may need to adjust the directory permissions:
cd /opt/
sudo chown -R root:root FileZilla*
After installing, FileZilla will periodically check for updates. It will download them to the ~/Downloads/ directory. Run the above command to install the new version.
If you want to be able to launch Filezilla from your dashboard, or to pin it to your dock, you'll need to create:
/usr/share/applications/Filezilla.desktop
Place this text in it:
[Desktop Entry]
Name=Filezilla
Comment=FTP
Exec=/opt/FileZilla3/bin/filezilla
Icon=/opt/FileZilla3/share/icons/hicolor/scalable/apps/filezilla.svg
Type=Application
StartupWMClass=filezilla
Categories=Game;
What a faff!