Same problem for me. To further explain, the Updater file DOES exist within my zipped folder for E19, but does not transfer over when I unzip the folder. Copying the file directly from the zipped folder to the unzipped folder and then attempting to open it causes Windows Defender to issue a warning. Attempting to select Run Anyway immediately causes the file to shut down with an error message, and the Updater is no longer in the folder after this.
I have tried to completely reinstall the Zipped file from both mirrors, as well as attempt to alter permissions, but this issue has not been fixed for me.