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You should take the latest version on the Nexus as the file here is very outdated.
I should get around to just letting the quest complete once you've killed the Firstborn without the imperials. You were supposed to follow the imperials before encountering the outpost at first, and then the quest would proceed normally.
See if the commands "Setstage arnimamainquest2 50" "Setstage arnimamainquest2 60" work.
If you have version 3.2, then you have to talk to the man next to the "entry point" to take you back to skyrim.
Yes it is the full version.
The entire main quest is voice acted, 2 minor side quests are missing their voice acting. And some random NPC dialogue too.
Standalone update, I may upload another full version with some fixes soon.
You can play it now, not much will change in the final except some voice acting.
It's completely playable. It's only unfinished in terms that the voice acting isn't 100% done. More like 90%.
Version 2.11 is fixed and you can download from here.
Download from the nexus as this version is bugged.