I've downloaded the MacOS obduction_1.4.2.24016_04.zip file twice on different machines, and both were identical and both were corrupt. Neither BetterZip nor the command line unzip program could unzip the file successfully.

Here's the info:

size:
~/Downloads$ ls -l obduction_1.4.2.24016_04.zip
-rw-r--r--@ 1 bob staff 10117244505 Jun 10 11:56 obduction_1.4.2.24016_04.zip

md5sum:
~/Downloads$ md5sum obduction_1.4.2.24016_04.zip
MD5(obduction_1.4.2.24016_04.zip)= 276660a9d3b6dee40ecb40ccb6a4f7dc

unzip:
~/Downloads$ unzip -t obduction_1.4.2.24016_04.zip
Archive: obduction_1.4.2.24016_04.zip
warning [obduction_1.4.2.24016_04.zip]: 8589934592 extra bytes at beginning or within zipfile
(attempting to process anyway)
file #1: bad zipfile offset (local header sig): 8589934592
(attempting to re-compensate)
testing: Obduction.app/ OK
testing: Obduction.app/.DS_Store OK
...
testing: Obduction.app/Contents/UE4/Obduction/Content/Paks/ OK
testing: Obduction.app/Contents/UE4/Obduction/Content/Paks/Obduction-MacNoEditor.pak
error: invalid compressed data to inflate
file #1065: bad zipfile offset (local header sig): 1526842388
(attempting to re-compensate)
testing: Obduction.app/Contents/UE4/Obduction/Content/Splash/ OK
testing: Obduction.app/Contents/UE4/Obduction/Content/Splash/Splash.bmp OK
At least one error was detected in obduction_1.4.2.24016_04.zip.

Please help. And, no, the app won't launch when I double-click on Obduction.app.

Edit: I tried posting this to the support page, and after I hit submit, there was no feedback, and I couldn't see it in my activity.