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Tushar PanditTushar Pandit 

I am getting the following error... The unmanaged package "DreamHouse" is already installed in your organization. You will need to uninstall it before installing a new version. ​How do I unistall it?

Just create a new trailhead org and install unmanaged package on to new trailhead org. Logout from your previous developer or trailhead org session forcing new org credentials to be supplied.
Use new trailhead org credentials. You can find help how to identify your trailhead username and password in challenge itself.
Suraj TripathiSuraj Tripathi

Hi Tushar Pandit,

If You want to uninstall package you need to do following steps:

Click on setup >> Quick find box type installed package >> click on installed package >> beside DreamHouse package Click Unistall.

Note: Plaes make sure you are not using any vf page, fields, object any where.

Hope it will help you.