If you cannot upgrade your OS and need vector design tools that actually run on macOS 10.11, you should consider alternatives. These versions are older but may still function on El Capitan:
: Many sites claim to have "OS X 10.11 versions," but these are often malware or broken wrappers. coreldraw for mac os 1011 upd
A good third‑party article (still accessible) is from or MacWorld UK circa 2019: If you cannot upgrade your OS and need