Hello,
There does not appear to be a .vsix installer in the download anymore.
How can one install the templates into Vs2010? Thank You!!

I figured it out, although there may be an easier solution. I copied the ProjectTemplates\Monocross directory to Common7\IDE\ItemTemplates, ItemTemplatesCache, ProjectTemplate, ProjectTemplateCache\CSharp directory within the Visual Studio 10 directory.
Then, from the Administrator Command Prompt ran the following:
c:\program files (x86)\Microsoft Visual Studio 10.0\Common7\IDE devenv /installvstemplates. It worked for me...........