CUDA 10.0 fails to install on Win 10 Out of diskspace

Having 2.5GB free on C: and 75GB free on E: I thought I should be able to Install the CUDA 10 Toolkit.

Both local and network installer fails with needs 381.52 MB on drive C:

Having tried to selcet only the CUDA part.
Changing install location from C: to E: => same problem ?

Windows 10 Pro ver 1803 17134.523
Having a an ASUS Geforce GTX 1070 card installed and working OK

Want to use it with my VS2017 that is also installed.

Any clues ??