I've been reading for the past days and I have answers for some questions and maybe in the future they could be of some help for someone.
Q: Where to find reference documents for the old models ?
A : The Adept webpage is still working (http://www.adept.com). In the support tab you can find document and software library sections which will help you solve 90% of your questions. Older robots and tools are in the Legacy section.
Q: Which ACE versions works with those robots ?
A: When I installed ACE, the robots s600/s800 and i600/i800 versions did not appeared in the available robots. I tried installing lower versions of the ACE software in order to find them without any luck (I think I gave up at version 3.5.x). Then I realized the correct software is called Adept ACE, It's found in the Adept Webpage > Software Library > Fixed > ACE path of the website. I installed the latest version (3.5.22) and It seems to be working fine, the only "error" it's showing me when I launch is a licencing error, but for what I read it only affects you if you want to work with vision.
I'm running on windows 11 and the installation process does not work smoothly when you press the setup icon, I had to install 2 dependencies manually (Sentinel Protection Installer 7.6.7 and OPC Core Components Redistributable) they are found in the Dependencies > Files folder. They are outdated versions and had to check some compatibility pop ups windows gave me but they seem to be installed correctly.