Im getting the same message. Server crash maybe? Probably quite the traffic right now.
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Per another thread, I am doing a re-install.
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Same here, saying the same thing 
I’m off today for the expansion and it came down late. I think they gave this stuff to offshore to administer and they’re messing it up as usual. There goes all that good cheap IT support !!! LOL
I always get the error 0x80070003 when I want to install the 4.43GB expansion pack.
I did buy it and already got the latest update on FH3.
Any idea?