do I have to re-download it?

[Rykuu_disaga]

I already have been playing AoEO since beta, and still have it on my computer, do I need to reinstall it for it to work on steam, or will it recognize I already have it on my computer? and will I have to re buy my DLC's from beofore, or will those carry over to steam?

[White Castle]

From the official AoEO forums announcement: http://forums.ageofempiresonline.com/forums/thread/180715.aspx

A few important notes: If you currently have AOEO installed and you want to switch to the Steam platform:

- Update and uninstall your current game then reinstall via steam. This will ensure the most efficient uninstall process and make reinstalling from Steam much smoother.
- The Steam version WILL include the GFWL platform (i.e. you still sign in with a gamertag etc).

Everything about your account is stored on their servers, so all of your purchases will remain intact.