Where can I download it?
For Tekla Structures 2016, the plugin download file can be found in the attachments 'One Click LCA® plugin for Tekla Structures (v.1.0)' (can be found at the bottom of the page)
If you are interested in the integration for other versions, please contact support.
How do I install it?
Unzip and run the installer using the default settings (note that you may need System Administrator privileges to install. Consult your IT support as required)