Does the plug-in work in Photoshop X?
SymmetryShop runs on both Windows and Mac OS (including the latest releases of Mac OS 10.x on both PowerPC and Intel) and is fully compatible with all versions of Photoshop starting from Photoshop 7 and including CS4 (both 32-bit and 64-bit). We recommend Photoshop CS2 or later because of the support of smart objects. See examples here.