Nice! Photoshop 2.5 for Windows was the first version I ever used. When layers arrived in version 3 it was a godsend, but 2.5 was still very useful for its color correction tools and the cloning stamp. At home I still use 5.5, because with effects, layers, and multiple undos, it does everything I need.
What amazes me is that Photoshop 1.0 can run directly off an 800KB floppy disk. At work I was set up with Photoshop CC 2016, which requires several gigabytes to install. The growth in program size has far exceeded the growth in functionality over the past few decades.