Hi Agnieszkas77143790,
NOTE: Officially the last version of Mac OS compatible with Adobe CS6 is Mac OS X v10.6.8 or v10.7.
Adobe Creative Suite 3, 4, 5, CS5.5, and CS6 applications support Mac OS X Mountain Lion (v10.8) when installed on Intel-based systems, see: Adobe Creative Suite 6 system requirements.
Please be aware that Creative Suite applications are not supported on macOS 10.12 (Sierra) or higher and therefore, many of the Creative Suite installers may not function normally on macOS 10.12 or higher.
Creative Suite 6 apps are pretty old and Adobe has not tested them on any of the latest operating systems post-Mac OS 10.8. Hence it may or may not work, you may also have compatibility issues.
However, you may try installing the product using the workaround given here: Installing Creative Suite on macOS 10.12 (Sierra).
Let us know if this helps.