If you have an original license key or installer, the following versions were the last to officially support this operating system: Photoshop CS4

CS6 requires Snow Leopard (10.6.8) or higher. The installer will immediately fail.

Look for used copies of Photoshop CS3 or CS4 on sites like eBay or specialized tech recycling forums. Ensure they come with a valid serial key.

If you're unable to download Adobe Photoshop or prefer a free alternative, here are a few options:

Adobe has never released a free, full version of Photoshop for any OS. However, there are three legitimate ways to obtain a version that works on 10.5.8 without paying Adobe today: