The version number 13.0.13 (sometimes written as 13.0.1.3 in build logs) was a post-release patch. Adobe’s update system for CS6 addressed:
If you have an original, legitimate copy of CS6 Extended, updating to 13.0.13 was essential for professional reliability. adobe photoshop cs6 extended 13013 original full
Search volume for “adobe photoshop cs6 extended 13013 original full” persists for several reasons: The version number 13
Because CS6 is end-of-life: