Hi there - you say

"I have finally downloaded & installed the demo version of KN SDExplorer"

If you mean that literally it could mean that this is a limitation of the demo version which was only meant to allow you very very limited testing of the tool.

"Can not open KN7000 file structure E:\: access is denied - The software will look to Drive E by default - IS YOUR SD DRIVE "E" if not then on installation you will have to correct this drive letter to the correct one.

Is your operating system Windows XP? If not - will not work.

Joan