Only if you already have a valid perpetual license from back when Adobe sold CS6. There’s no legal free download. Adobe’s official site offers only Creative Cloud versions today.
If you are searching for a "Photoshop CS6 download GitHub" link, you are likely looking for a way to use the classic, non-subscription version of Adobe’s flagship software. However, downloading professional software from unofficial repositories carries significant risks that could compromise your computer and your personal data. Is Photoshop CS6 on GitHub Official? photoshop cs6 download github
If you already own a genuine license for CS6, you do not need to risk a GitHub download. Only if you already have a valid perpetual