Finding an is a common challenge for users trying to revive older software. Adobe released CS3 in 2007, and since then, the way the company handles "activation" and "authorization" has changed significantly.
Even if you find your authorization code, Photoshop CS3 is 32-bit software. authorization code for photoshop cs3
CS3 will not run on any version of macOS newer than 10.14 (Mojave) because modern Macs do not support 32-bit applications. Beware of "Keygens" and Crack Sites Finding an is a common challenge for users