Cosmos back on !
I completely reinstalled my MacBook m1, new system all erased.
I got C4D 2025.02, CR 13 aug.28 2024 and OSX 15.0.1 running now, all new installed.
Whole process took me about 3 hours. But Cosmos works now again and everything seems fine.
C4D 2025 starts up now with a standard scene file logo with Redshift settings, camera and so on. Never knew before you could set a standard scene file. So I made my own with Coronarender settings. Such a relief I don't need to set all to Corona each time start something new.
I have no idea why my system corrupted Cosmos especially. I played a little with Redshift but it was extremely slow compared to Corona on my MacBook. Corona IR is a lot more responsive than Redshift on CPU.