Manually downloaded skyrim mod error

So, I know there is a MO2 subforum, but the rules said it was only for Skyrim Special Edition and Fallout 4, neither of which are relevant to me. I am using MO2 (or TRYING TO) for Skyrim legendary edition, so I'm not sure if I'm allowed to post there.

Anyway I have done lots of research and either the fixes I found in other threads are not working, or I am too much of a neophyte and I am not applying them properly. I have uninstalled and reinstalled MO1 Legacy and MO2 multiple times to no avail, I have attempted to use nxmhandler.exe multiple times in various different ways, I have clicked and dragged mods and folders to different directories. No matter what I do, every time I try to "download with manager," I get a red-circle-with-x windows error popup that says no program is associated with the file type. I tried to go into the settings in MO2 and click the little rectangle that says "Associate with 'Download with Manager' links," but then when I open up settings again, the box is not clicked! And, of course, clicking it has no result in terms of downloading.

Now, I am aware that I can manually download mods and drag-and-drop them into the mods folder in the MO2 directory. Ignoring the fact that this is rather inconvenient, this issue has now become a serious bother to me. I am somewhat neurotic and obsessive and I am greatly upset that I cannot get this program to work properly, especially since I installed it on my potato school laptop and IT WORKED PERFECTLY. I feel like I'm trying to solve a rubiks cube in the dark, and it is zapping my neurons.

It may be relevant that I used the old version (not legacy, I am referring to the pre-legacy version 1.3.something) of for a very long time. Upon discovering that I could no longer "download with manager," I decided to upgrade to MO2, but this proved to be more challenging than I anticipated; it's quite possible that my current issue is a result of a mistake when I originally tried to install it. I should have just downloaded the 7zip version, but noooo, I had to pick the installer... as I said before, I may be retarded, but please, anyone who can help me with this, I would really appreciate it.

When I tried to use nxmhandler.exe, I was quite confused; I successfully associated it with the relevant game (I think; is SkyrimSE supposed to mean Special Edition or Script Extender?), but at the bottom it says "Primary Handler: E:\ModOrganizer\Mod Organizer\nxmhandler.exe," which is NOT the correct directory. My whole Mod Organizer folder is located in Documents in my C: drive (I did this because a thread I saw on this site suggested not installing it anywhere near skyrim or program files), yet nxmhandler.exe will not let me change this? I even tried MAKING a directory that agreed with the listed location, and I copy-pasted nxmhandler.exe into it, but it doesn't seem to have fixed anything.

Thanks for any help. -FlameNoir

TL;DR the new EU legislation ruined my life /s

Edited by FlameNoir, 05 June 2018 - 06:49 PM.