Upon updating to V25, I redownloaded my games to find that some of them are completely broken!
They instantly crashed upon launch and upon investigation I found that the executable binaries in the .app packages are completely null (as in files are of the same size, but filled with nulls instead of actual data).
Note that this is not a problem caused by the developer of the apps, as when the apps are downloaded through the website and installed manually they work.
Therefore I believe that some part of the delivery/installation routine in the itch.io desktop app is failing to write data in some way.
My OS is macOS 10.13.2 (64-bit).
Installed component versions are firstname.lastname@example.org, email@example.com and firstname.lastname@example.org.
I will provide additional information if required.