This is the most critical concern. Because this software is distributed through third-party "warez" sites, torrent trackers, and peer-to-peer networks, there is no guarantee of file integrity.
It is essentially a "ripped" or compressed version of the program, stripped of some heavier files to make it lightweight and standalone. Adobe Photoshop Cs6 Portable
: A powerful, open-source desktop image editor that is completely free and has a dedicated "portable" version from PortableApps . This is the most critical concern