Legally speaking, the only way to use Photoshop 6.0 for free is:
Downloading legacy "abandonware" from unofficial sources is not recommended by experts on the Adobe Community . These files are frequently bundled with unwanted software and do not receive any security updates. adobe photoshop 6.0 free download
Adobe Photoshop 6.0 was released in and was never officially released as "freeware." Adobe's current business model centers on the Creative Cloud subscription. Legally speaking, the only way to use Photoshop 6
(e.g., for a blog about retro software), here's a template: for a blog about retro software)