Natron won't start on OSX

Hi, trying to evaluate Natron on OSX however it won’t start. I seem to meet the minimum requirements and have tried the suggestions in the documentation (right click → open, system preferences security and spctl --add /Applications/Natron.app) but nothing works. Is there anything else to try?

I’m using:
OSX 10.8.5
16GB of memory
40GB of disk space
OpenGL version string: 2.1 NVIDIA-8.16.74 310.40.00.10f02

Really? Perhaps running such an ancient version is at the root of your problem. I run High Sierra (10.13.6) and Natron fires-up without issue.

Here are my other parameters:

Model Name: MacBook Pro
Model Identifier: MacBookPro11,1
Processor Name: Intel Core i5
Processor Speed: 2.6 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 3 MB
Memory: 8 GB