I think Hummel left Gamestudio development for about a year now? Afaik he does not use Gamestudio anymore and never really had plans for further developing LightFrog.
Also lightfrog is deadly imperformant as it uses simple shadow mapping with 6 views per shadow map (image your game takes about 6 times additional render time PER light)
Try to adapt Shade-C for your needs or just even try to understand shader programming. It isn't really hard, just the fine tuning is work.