The portable version of Adobe Photoshop CC 2014 v15.2.1.257 offers several benefits to users:

While Adobe Photoshop CC 2014 (version 15.2.1) is a legitimate legacy version of Adobe's professional image editing software, the specific "portable" version mentioned (v1521257 Nov 2014) is an unauthorized, modded variant not officially released or supported by Understanding Portable Software Versions