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General

Defender's Quest requires Adobe AIR to run. The game comes with an install script that should take care of the Adobe AIR installation for you if AIR isn't already detected on your system. While we try to make the script work on as many systems as possible, there may be systems where it fails. In those cases, please refer to the information below.

If the provided information does not solve your problem, please open a bug report in the Bug reports forum describing the issue and your system. If the AIR installation aborted, please make sure to also post the installation log from ~/.appdata/Adobe/AIR/Logs/Install.log.

Common issues:

If for some reason the install script doesn't show up when starting the game, even though you don't have AIR installed, you can manually run the script by executing the following command in a terminal:

~/.steam/root/SteamApps/common/DefendersQuest/install.sh

If this doesn't help, or you already have Adobe AIR installed, it might be an issue with the Adobe AIR EULA, see the corresponding section.

deb based Distributions (Ubuntu, Linux Mint, Debian):

On these systems, the installer should always work. If that isn't the case, please create a bug report in the Bug reports forum.

You can also try installing Adobe AIR using the official deb package. To do so, download the official package and install it using your distribution's package manager (usually by double-clicking the downloaded file). After the installation is done, you will have to accept the Adobe AIR EULA, so please follow the steps provided in the corresponding section.

RPM based Distributions (Fedora, RHEL and derivatives, openSUSE):

On these systems, the installer should work, but due to problems with the way the Adobe AIR installer handles RPM based distributions, the installation may fail. To work around this, you can try installing Adobe AIR using the official rpm package. To do so, download the official package and install it using your distribution's package manager (usually by double-clicking the downloaded file). After the installation is done, you will have to accept the Adobe AIR EULA, so please follow the steps provided in the corresponding section.

Arch Linux:

Unfortunately, Arch Linux is not supported by the official Adobe AIR installer. However, you can install the Adobe AIR runtime by installing the adobe-air-sdk package from the AUR and then following the steps outlined in the Arch Wiki.

Other distributions:

If your distribution is not supported by the official Adobe AIR installer, you will have to install the Adobe AIR runtime yourself. If Adobe AIR is in your distribution's repositories, installing the package from there will probably work. If that's not the case, you can download the Adobe AIR SDK, unpack it and follow the instructions in the Arch Linux wiki on how to symlink the runtime and accept the EULA, so that the game recognizes your installation of the Adobe AIR runtime.


Manually accepting the Adobe AIR EULA:

In certain cases, the Adobe AIR runtime may be installed on your system without you being asked to accept the Adobe AIR EULA. In those cases, trying to run any Adobe AIR binary will silently fail. To resolve this issue, you will have to manually accept the Adobe AIR EULA by following the steps outlined on the Arch Linux wiki.