I have Illustrator CS5 and High Sierra. Illustrator doesn't start even from terminal. This used to happen even before upgrading to High Sierra, already in OS10. However, if I change user (e.g. use a guest account) it opens, and I guess functions OK. This is the error it gives when I start it from the terminal:

/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.30.2/Common/ChunkCompression.cpp:50: Error: unsupported compressor 8

/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.30.2/Libraries/CompressData/CompressData.c:353: Error: Unknown compression scheme encountered for file '/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/Exceptions.plist'

/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.30.2/Common/ChunkCompression.cpp:50: Error: unsupported compressor 8

/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.30.2/Libraries/CompressData/CompressData.c:353: Error: Unknown compression scheme encountered for file '/System/Library/CoreServices/CoreTypes.bundle/Contents/Library/AppExceptions.bundle/Exceptions.plist'

libc++abi.dylib: terminating with uncaught exception of type std::out_of_range: basic_string::at

Abort trap: 6

I can post the crash report if useful, but it is a bit verbose...

Anyone can help ?

Thanks