Archive.org is hosting this gem:
Photoshop 11
Maybe we can add it to the internal server by early 2019 or a little sooner.
The DVD may be used to install the English, French or Spanish flavour of Photoshop 11
as 30 day trial or with a valid serial.
To my knowledge, activation servers for CS4 are still online,
so be sure brain is engaged before taking action. 
Manuals for non English installations may be downloaded from Adobe:
https://helpx.adobe.com/photoshop/archive.html
Mac OS
• PowerPC® G5 or multicore Intel® processor
• Mac OS X v10.4.11–10.5.4
• 512MB of RAM (1GB of RAM or more recommended)*
• 2GB of available hard-disk space for installation
• 1,024x768 display (1,280x800 recommended) with 16-bit or greater video card
• DVD-ROM drive
• Some GPU-accelerated features require graphics support for Shader Model 3.0/OpenGL 2.0
• QuickTime 7.2 required for multimedia features
• Broadband Internet connection required for online services
*NOTE: 3D features in Photoshop Extended require a minimum of 1GB RAM
