You don't download deployment packages to your modeler: you either download a version of the model from the team server to edit it, or you download (or recreate) a deployment package.
To download a previous version of the model: Install Tortoise SVN (version 1.7). Right click in the folder where you project is. In the Tortoise SVN menu, select update to revision. Fill in the previous version number. See also this post.
Create a branch line and download that branch. Recreate the deployment package.