Lightning will not work at local computer, only at real server with real domain name.
Important! Before using Lightning disable or remove all caching and optimization extensions/mods – if you have any. They may cause conflicts and will make total speed slower. Lightning speeds up every aspect in more effective way then competitive extensions.
So, you have
Upload lightning338.ocmod.zip to Extension Installer.
Unzip lightning338.ocmod.zip
Upload lightning.ocmod.zip to Extension Installer
Upload files from the upload folder to your shop root
Go to Modifications and press Refresh.
Upload lightning338.ocmod.zip to Extension Installer. Go to Modifications and press Refresh.
Upload files from the upload folder to your shop root