CUDA update 5.5.25 Mac OS 10.8.6 not installing, no destination listed

the update process (also when downloaded from the website) halts at the point where one needs to select a destination for the installation. no destination is listed and “install for all users” is faded out. it says like this over minutes, nothing happens. any suggestions?

I’m having the same problem with my Mac Pro and NVIDIA Quadro FX 4800 running 10.6.8.

I was running CUDA 4.?.? and tried to update to 5.5.25 and had the problem described.
I then tried 5.5.24, same problem.
I then tried 5.0.61 and it installed with no problems.
I then tried to install 5.5.25 again, and still no go.

Model Name: Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 8

System Version: Mac OS X 10.6.8 (10K549)
Kernel Version: Darwin 10.8.0