I downloaded the Remote Utilities Host file host1.0.22.b22_x86_64.rpm and
QNA{QFinderProUbuntux64-7.13.0.1014.deb (I was able to install this on a pc with CInnamon so I’m assuming it’ll work with Fedora).
How do I install them?
Hi and welcome to Fedora!
When asking questions it may be beneficial to specify what you’re using (Workstation, Silverblue, KDE, Kinoite etc), since UI and performing certain activities may vary a bit 
In general, Fedora is using dnf, which is an rpm-based software. Installing .deb files isn’t possible on Fedora nor derivatives. You can (generally) install only rpm files and flatpaks (like from Flathub or Fedora remote). In the case of rpm packages, assuming you’re using Workstation or KDE, just click on the file and it should take you to the App Centre. You can install it from there.
Hope this helps!
Thank you. I’m using Plasma.
Not directly, no. However, you can use alien (available from the Fedora repos) to transform the .deb into a .rpm and install that. One Warning, though, I have heard of cases where the transformation was unsuccessful leaving you with a .rpm that won’t install, but that seems to be very rare.
Thank you. I’ll give that a try. I can always just download the file again.
That does not appear rare at all for me.
I have never been able to properly convert a deb to an rpm and install it.
In my experience the issue is most often the names of libraries or dependencies needed and the fact that rpms have a scripting and dependency config that is much different that what is used in debs.
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I assume you mean QNAP Finder Pro from https://www.qnap.com/en/utilities/essentials. That page lists supported Supported OS:
Windows 8 (or later versions), Windows Server 2016 (or later versions), macOS 10.14 (or later versions), Ubuntu 18.04.
That suggests they don’t support newer Ubuntu systems, so unlikely to work on any newer Linux system.
Correct, I meant QNAP Finder Pro. They have three versions for Linux, but I only downloaded one. Right now I’m just poking around. I lost a lot time yesterday because there was a power outage for several hours. Right now I’m poking around Zorin.