I am not sure if you still have the issue, but if so, it could be Permissions.. Contact Support with the Error Details and they should be able to help out.

With regards to the MAC Overwriting Folders, that is something Window Users need to understand before they lose everything installed by moving one folder and file.

For extracting ZIP Files, you may want to check out Stuffit Expander. It has a Merge Option, which allows you to extract Files to the target location without Overwriting.

ratscloset
aka John