Trying to install an expansion.

It gets to 14 percent each time and I get the following error:

Feature transfer error
Error:-995 The I/O operationhas been aborted because of either a thread exit or an application request.

What does this mean and how can I fix it?

Try making an image out of the file with something like Alcohol 120 and then installing from that. It sounds like a drive issue from the crazy no-resolution Google results I'm getting.

?