was released in 2012 as the final perpetual-license version of Photoshop before Adobe transitioned fully to the Creative Cloud (CC) subscription model. The "Extended" edition included everything in the standard Photoshop CS6 plus advanced tools for 3D design and scientific image analysis.
Portable apps are more prone to crashes if the USB drive is disconnected. Use Ctrl+S frequently. Consider enabling every 5 minutes. Adobe Photoshop CS6 Extended Portable