Ich will Adobe Photoshop für Mac OS 12.7..6 Monterey herunterladen und es gibt keine passende Software

Photoshop 26 (aka 2025) requires macOS v13, 14, v15 (see link).

As Adobe provides only one version back in the CC application (Photoshop 27 being the current general release that would mean Photoshop 26) a version for your OS version is not available anymore. 

https://helpx.adobe.com/photoshop/desktop/get-started/technical-requirements-installation/adobe-photoshop-on-desktop-technical-requirements.html