4.5.2 DMG seems to be corrupt
Downloaded the 4.5.2 version soapUI-4.5.2.dmg and it seems to be broken somehow. Finder can not open it. Just FYI. I'm trying 4.5.1 to see if it's less broken.
Forum Discussion
usually, you can also install soapui from a zip file (only require you to unarchive the file)