@Rob i just went and tried it and on downloading i got this.
The amusing thing is the download failed because i ran out of disc space (tiny ssd and forgot to change download location lol!), However even with a failed download i get a .part file not a .14 etc extension.
When i try to open the failed file it still gives .exe.part file extension and not the .14 etc
To me it sounds like something got corrupted during the download somehow as the extension does not match anything to what it should be.
Edit :- On downloading to another disc it worked fine (I have 4TB of drives and its still not enough!!!)