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hidden.platypus - If the computer in question is your personal computer then IMO its you who manages everything that happens on it. Software firefox, calibre or windows itself are merely tools - they have no autonomy
I've had firefox do a download but when I looked in the place where I thought it should be it wasn't there, when I checked the download location in firefox it had put it elsewhere. It was always some addon, firefox itself, or me that screwed up.
My work practice is to download software installs (zip's, exe's and msi's) to %UserProfile%\Downloads\Software folder, install the software, then move the software install to my Software Installs folder, which happens to be on another drive. Because I have to do something - execute and move the install file - I get the chance to see any oddities. My expectation is that my download subfolders will be empty or only contain things I just downloaded.
IMO keeping everything ever downloaded in the downloads folder (as I often see in my travels) is a poor work practice. But no matter how much I brow beat my friends when they call me in to "fix their computer" they persist in doing it.
If I have any issues with a download via firefox then one of the things I do is use IE or Chrome to do the download, sort of like getting a second opinion - I have them configured to download to the desktop.
If you downloaded from FOSSHUB perhaps they screwed something up. They don't seem to have previous versions so I can't download 1.37 from them. If you upload your recalcitrant copy of calibre-64bit-1.37.0.msi somewhere and PM me the link, then I'll compare it to my copy and install it on my test rig and see what happens there.
Below are the MD5 and SHA hash codes for my E:\Software Installs\Productivity\Calibre\calibre-64bit-1.37.0.msi
Code:
CRC32 b6f9d304
MD5 b9cd32926448ce03dfe0dcac22f0fe0d
SHA-1 64715c81714d951b67714650b2e44c76f313a267
SHA-224 b3dd0b10cceeca19526f8c98bc8fabe766f2c74e347d91e4996de0ac
SHA-256 ac06c5acd065615a70c9c801d5c26b701bbf0b28daafdb47abe758aa90c5fa79
SHA-384 f10a71bb2a2f4619bc663a1a112bc30b39ad3ce055f1578003ce988f904c2d2c74000c47fcc39b7b10dc633a8240205f
SHA-512 1f08ebf948b13ddb5aecc1dc93db92c1e550446d8b4ade115df59016a1d13339a95df330e615db896077a44b2d4deb9b67b26e6fb9a6799d6447c85fa89e8cd1
BR
It might have been the spooks, thanks to HRW I lost 8 years of emails because I used the same email service as Greenwald's source. HRW broadcast that fact on Facebook, so to save face NSA shut down the email service.