The message "Error message: “cuda-mac-5.5.28_10.9_64.pkg” can’t be opened because it is from an unidentified developer."
means that you have still your system locked, impeding to install third-paty software, except from the App Store.
This is now the default behaviour since OSX 10.8, and of course you need to get rid of this. You want to install whatever software you like! Another bad move toward "iosization" of OSX...
For removing this lock, go to System Preferences, then follow the instructions given here:
This will allow you to install the CUDA developer kit, but I do not know if this was also the same issue impeding you to install CUDA inside After Effects...
I'm having a similar problem. Mac Pro OSX (10.9.3). Adobe After Affects tells me to instal CUDA 5.0. I went to CUDA site and downloaded the latest toolkit. When I go to install (after reading and agreeing to terms) I hit continue and I get:
Installer quit unexpectedly.
Any words of advice?
Ok so I just learned I was installing the wrong thing. It was the toolkit for developers. I downloaded and installed the CUDA driver 6. It appeared to do so successfully but afterwards I got this pop up message:
System extension cannot be used
The system extension “/System/Library/Extensions/GenericUSBXHCI.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
Does this mean it didn't install correctly? What should I do now?