So I recently upgraded my mac pro tower to 10.11.6 build number 15G1217 and I have not been able to even launch Touchdesigner 099. It attempts to open, bounces for a bit then just disappears and gives me an error message with an option to relaunch however that leads to the same result. I also tried creating a new user however that gave the same result as well.
The machine im running on has 2 x 2.8 GHz Quad-Core Intel Xeon with 18gb of ram and an ATI Radeon HD 5770 1024 MB
Is it not launching, or is it crashing? If it is not launching, do you see any messages in Console->System Log? If it is crashing, can you check Console->User Reports and see if there’s a crash log of the form TouchDesigner099_XXX.crash?
If you post the information above, we can try and figure out what is going on. One more question, which version of macOS are you running?