CS6

All Creative Suite products were discontinued in early 2017.

CS1, CS2, CS3 and CS4 activation servers are dead & gone. Even if you find an old installer, it's impossible to activate the software.

CS5 and CS6 are on life support. But they can still be activated providing you have the following:
1. your 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) and if it was an upgrade, a qualifying serial number from an older product,
3. an older operating system that can support legacy 32-bit apps.

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: Legacy Creative Suite will never run on Catalina, Big Sur, Monterey, Ventura... Nor will it be tested on Win 11. Only the latest Creative Cloud products are compatible with newer systems.

NOTE 3: Legacy Creative Suite is unsupported. It might work, it might not.  Use at your own risk.

CS6 has not been sold for several years, but if you have a valid serial number you may still install and activate

CS4 and earlier are now dead programs due to the activation server being removed from service

everything in cs6 is treated the same. (and everything prior to the last two cc versions) is no longer supported.