A complete list of ALM install instructions are located here: Install DevTest ALM Plug-in - DevTest Solutions - 10.1 - CA Technologies Documentation
Ensure the pre-reqs are followed and that your system is running 64-bit DevTest.
The installer is located here: LISA_HOME\addons\qc\DevTestALMPlugin_x64.exe
The installer creates the DevTestConnection.properties file.
For issues with 10.x, create a support ticket and the team will help you out.