Hello,
Apple File System (APFS) introduced with High Sierra is faster and better for a SSD but not fully compatible with CS6.
Fortunately it's possible to install macOS High Sierra without APFS conversion:
- Download macOS High Sierra from App Store.
- After download is complete, the installer opens automatically. Leave the window.
- Open Terminal (or from the Utilities screen menu options if booted from a USB boot installer) and paste:
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall --converttoapfs NO
- Hit return key.
This will force installer to bypass APFS conversion. High Sierra will run on HFS+.
I didn't find any errors so far!
Filip