After downloading the packages, go to your Skirmish! client and use the package panel in the top right to import the content into your Skirmish! asset library. We will soon modify the client so packages can be downloaded and auto updated from the client itself soon.
When I try to upload these files using the Package Manager, I get the error "Source and destination path must have identical roots. Move will not work across volumes." Any suggestions?
Hmm it looks like you have your temp folder set to a different hard disk than your my documents folder. Is that so? While that's fixed you may want to rename the packages to zip, extract them somewhere and import the extracted files into your library manually.
Your game (map) library is on File - Open Game. Your character / props library is on import Character / Props / etc, which is on the Add (+) button on the top left (below the File menu)
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Btw, we will have a quick starter video series up tomorrow showing how to use the core functions and getting the most out of Skirmish!
While that's fixed you may want to rename the packages to zip, extract them somewhere and import the extracted files into your library manually.
Your character / props library is on import Character / Props / etc, which is on the Add (+) button on the top left (below the File menu)