Assuming you copied the dlls from the distributed libWin32 folder, if you get this on "Send to all" that could mean issues with retrieving the registered notification from the dataset or something related to the SSL part.
You mention you get the same error on your development environment. Does this happen in release mode only? Would it be an option to run this in debug and break on execution to see the stack trace?
It used to work in the past, but now it does not seem to work anywhere (also tried Delphi 13, both in debug and release mode). It seems it has to do somewhere indeed with SSL.
Thank you for the additional details. The IOHandler issue is something we already fixed internally and it is awaiting release. In the meantime, we'll provide an incremental source update in a private message.