Some universities host legacy CONWEP DOS executables for educational purposes under strict "no-commercial-use" licenses. Search for "CONWEP 1.07 DOS" – this is an earlier ancestor, not exactly Version 33, but pedagogically useful. Version 33 is rarely found here.
Many "free download" websites will offer a file named conwep33_setup.exe that is actually adware. Solution: Only download from registered domains (.edu, .mil, .ansys.com, lstc.com). conwep software download 33