It's 2020 and this is where things stand right now. CS1, CS2 and CS3 are dead & gone. The activation servers were removed from service years ago. Even if you find an installer, it's impossible to activate the software.
CS4, CS5 and CS6 are on life support. Adobe removed links to old installers. But the software can still be activated providing you have the following:
1. original media (disks or downloads) you received at purchase and a way to read them,
2. a legitimate serial number for that version, language and platform (Win/Mac),
3. an older operating system that can support legacy 32-bit apps.
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NOTE 1 : Creative Suite installers won't work on macOS Sierra, High Sierra or Mojave without terminal workarounds. See the help article below.
https://helpx.adobe.com/creative-cloud/kb/install-creative-suite-mac-os-sierra.html
NOTE 2: Creative Suite cannot run on Catalina. Either downgrade your OS, set-up a virtual machine or get all new, 64-bit software. Your choice. https://www.adobe.com/creativecloud/plans.html
NOTE 3: Legacy Creative Suite is discontinued & unsupported. Use at your own risk. Adobe support cannot help you with anything except an activation count reset.
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Beware of fake Adobe reps who may contact you privately offering to sell you software or take control of your computer. It's a scam, run away!
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3 Easy Ways to Identify Genuine Adobe Staff
https://tinyurl.com/10791730
[Moved from Licensing to Download & Install.]