I have received two patches from 2 different people running Rack under macOS and it appears that neither can be opened by Rack 1.1.6 / Windows 10 with all plug-ins up to date.
What’s troubling is the fact that there’s not even an error message. Also, the previous patch remains on screen.
Sounds most likely then it’s your mail client (or that of the sender) which is messing the files up.
I can’t see anything useful in that log file. It looks like you tried to load the patch, nothing further was logged, and then you closed the application 6 seconds later.