Packages that are downloaded from the Projects page are usually a ZIP file containing a folder structure full of XML files. You can use NASH to import these files into your Innovator instance, one at a time, or use the Import.Exe to import the complete package.
Documentation on Import.Exe is not clear, so here's a quick step-by-step.
1) Unzip the package you donwloaded into a folder on the Innovator server.
2) Run Import.Exe on the server (should look like the screen shot above)
3) Specify the Server (e.g. http://localhost/InnovatorServer )
4) Click on the …. Icon to the right of Database. This will fetch the list of available databases
5) Select a database from the list
6) Select a Username. For importing, this is usually someone in the Administrators group, such as Admin or Root
7) Enter a password (for a default Innovator installation, the username=admin and the password=innovator)
8) Click on the Logon button
9) Specify the path to the Manifest file for the Package (use the …. Icon to file browse for it). This will populate the lower left window “Available for Import:
10) Select the Package you want to install in the lower left window.
11) Use the Import button at the top of the form.
I usually run with the “Merge” and “Thorough” modes selected.