Opening PSD files using Photoshop

I am browsing sample brochure templates at this website. The templates are available in PSD format.

To open PSD files, I downloaded a trial version of Photoshop CS6. But whenever I double-click a PSD file, I get the following message:

Some text layers contain fonts that are missing. These layers will need to have the missing fonts replaced before they can be used for vector based output.

I am new to Photoshop; does this message mean that the available PSD file has some issue or am I not opening the files the right way ? I need to edit these templates as-is using the fonts shown.