You need a few things before installing Unsigned. The first is a compatible PC running windows XP or higher. You need at least 1GB of RAM (at least 1.5GB if you are running Vista), at least 1.2 GHz processor. You need a graphics card capable of running Shader Model 2.0.
In terms of software you need the .NET Framework 3.5, the XNA Framework 3.0 Redistributable.
Got all that taken care of? Run the following setup file.
Unsigned v126.96.36.199 (EXE)
Alternatively, you could compile from the source for the latest version by following this guide.
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Unsigned v188.8.131.52 (EXE)
Unsigned v184.108.40.206 (RAR)
Unsigned v220.127.116.11 (RAR)