Technically, yes. Practically, it is complicated.
The request for "Adobe Photoshop CS1 free" often stems from a historical misunderstanding regarding Adobe's software distribution. While Adobe Photoshop CS—released in —was a revolutionary step in digital editing, it was never officially released as "freeware". adobe photoshop cs1 free
Installing Adobe Creative Suite 1 [CS1, CS2 and CS3 are dead] Technically, yes