Did someone manage to install Trapcode Lux for CS5 on windows 7? It looks as there is a security problem with plugin registration - it accepts serial but doesn't remove the red cross. It works ok though for XP and Vista. Also, I don't have any problems with other Trapcode plugins on win7. Only lux is causing problems.
Also, are there any similar plugins to create volumetric light effects as Trapcode Lux?
If it's a known issue, it should be listed somewhere in the RG support section. If you know your way around the registry, you may also have luck adding the key manually. I would look where the otehr keys are stored and then simply add the one for Lux. If it is already there, you may have a permission issue with your registry key. Do the same as when changing these things for fiels - right-click, Permissions...