opencl sdk problem

from where i can download sdk to NVIDIA GPU
i am not able to find gpucomputing sdk 4.2 which i downloaded previosly
thanks

You can find a full archive of all the CUDA Toolkit versions here:
https://developer.nvidia.com/cuda-toolkit-archive

is it same which i used for opencl c previously, or for cuda c
thanks

I believe it’s the same SDK for both CUDA and OpenCL, but I could be mistaken.