Can I run Page Curl Pro 2.2 as a standalone application?
No, you cannot. Page Curl Pro 2.2 is a Photoshop plugin. Therefore, you can use it only with the image editing applications (hosts), such as: Adobe Photoshop Elements, Adobe Image Ready, Adobe Fireworks (formerly Macromedia Fireworks), Corel Paint Shop Pro, Corel Photo-Paint, Ulead PhotoImpact, etc.). See the list of the supported hosts in the description of this Photoshop filter.