You own a legacy Intel Mac running macOS Mojave or older, you have a valid original CS6 serial number, and you have verified the checksum (MD5 hash) of the file matches official Adobe hashes.
Here is the most important section of this article. photoshop-13-ls16.dmg
Modern Photoshop is filled with cloud syncing, font servers, stock photo libraries, and AI prompts (Firefly). Many professionals miss CS6 because it was fast, stable, and didn't require an internet connection to launch. You own a legacy Intel Mac running macOS