[DCP-o-matic] Mac OS X legacy support

I remember a thread in the forum where one guy was running dcp-o-matic on a G5 PowerMac. I was surprised it actually seemed to run on a PPC. Does anyone know exactly which OSs are still supported? A friend just wanted to test-drive it on his video-editing G5 running Tiger/10.4, but it didn't start. Same result on an Intel iMac running 10.5.8. The lowest OS X version I do usually test is 10.6.8. I think the guy on the support forum mentions 10.7 on a G5. I always thought 10.5.8 was the latest OS X version supporting PPC? - Carsten